Interesting post. The goal would be to teach someone to shoot. I often have women come to me with a small carry gun their husband bought for them. But they never really learned to shoot, and are having trouble with it.
So first, teach them to shoot according to NRA basic pistol methods (or have them take the course if they want). Then, use the variety of guns I own to transition them to smaller carry guns with increasing recoil. I would like to own a medium .38 for this transition, but I don't. Thus the use of a couple 9mm for that bridge. And the people seem to like knowing they can shoot a semi-auto as well as a revolver.
Here is your chance to help the OP and me by giving us good details of a better training approach and gun selection advice for his soon to be wife. I know you prefer semi-autos, so I'm not sure if you will be able to offer any revolver help, but please do try to offer some help
It has nothing to do with platform selection. Revolver, autos, whatever one likes. The basic concepts behind learning to shoot should be the same.
When working with a brand new shooter, especially a female adult that has never handled a firearm before, it is most important to understand the emotional side of things. Sounds misogynistic, but it's true. The basic idea is that, if they aren't having fun, aren't getting on target quickly, they will grow frustrated and tire of the endeavor very quickly. Conversely, if they have some good success, right off the bat, their interest will be peaked, and they will be more apt to stick with shooting as not just training for SD/HD, but as a hobby.
The main emphasis (and I have taught a few new female shooters, and gotten them on target @ 7 yards, taking out the black, very quickly) is on trigger technique and muscle memory patterns. By far, the most important part, is trigger technique. A trainer can teach stance, grip, sight alignment, and other techniques, but if a new shooter doen't first start with (and master w/dry-fire) trigger technique, their rounds will never be accurate, and the rest will all be for naught.
Your idea of using a S&W63 is good, because it's a j-frame in .22 (please correct me if I'm wrong), and almost identical to a Rossi .38 So it will have almost identical ergonomics, trigger and sights, but with less recoil. That is a good idea once you get to the range with a new shooter, but the ground-work for said new shooter has to start without shells, without live-fire.
With new shooters, I have always started with quite a bit of dry firing, at home, in a quiet and relaxed atmosphere. This gives a new shooter the chance to learn in a very concentrated manner, without the distractions of loud, concussive fire going off all around them. This gives them the chance to focus on, feel and learn, the mechanical break and re-set of the particular trigger they will use in the future.
Atmosphere is extremely important. The normal atmosphere at a gun range is loud, concussive, intimidating, and sometimes downright scary for new shooters. We experienced shooters don't even notice it, it's just part of the scenery. But for new shooters it can be an over-whelming experience, so it's best to teach the basics in a quiet, relaxed environment. Starting with lots and lots of dry-fire, where trigger control techniques, along with proper grip, can be learned. I acutally have found that sitting on the couch, dry firing and focusing on nothing but trigger technique and grip, is an awesome way to start. Then, once that is comming along nicely, stance can be taught. Oddly enough, sight picture I have almost never even discussed, unless the person in question is obviously struggeling with it at the range. Sight picture is a pretty natural thing to figure out. I do, however, discuss the need for vision focus on the front sight.
Another idea is to try to avoid turning learning to shoot into a classroom session. I have found that teaching is best done (given the opportunity, like when living with said new shooter) whenever the perspective new shooter expresses interest. With the OP, he lives with his wife, so the at-home dry fire and such could be tried whenever she shows an interest. No need to force or cajole, just work with her whenever she shows interest.
I also would highly reccomend taking a new shooter to an outdoor range first, instead of an indoor range. The sounds and concussive effects are much lower outside. It's also wise to get to the range when you know it will be empty, like a Tuesday morning or something like that. With no other people shooting around them, the new shooter will have a quiet, relaxed atmosphere to try live-fire for the first time. If the ground-work has been done properly, I can almost guarantee that a new shooter will find themselves taking out the black at 7 yards right off the bat. Recoil, noise and muzzle blast should be the only new things to be experienced. The basics of trigger technique, grip and stance should already be understood and practiced.....and recoil, noise and muzzle blast are
enough to try and handle for new shooters, much less trying to pile-on learning all of the proper shooting techniques at the same time.
Getting into GLOCKs, Berrettas and larger revolvers will not help the OP's wife learn to shoot her Rossi .38. It will actually be detrimental, and move her backwards. Keeping with one platform, one trigger type, one set of ergonomics and muscle memory patterns, is paramount to a new student gaining confidence quickly, and enjoying a lifetime of shooting.
If you haven't noticed, I view basic pistol courses like ones that the NRA put on in classroom/shooting range environments, to be next to useless. It's usually nothing but a bunch of over-weight, middle aged wannabes enjoying the one time in their lives when women are pretty much forced to shut up and listen to them, and do exactly as they say. It's a very poor learning environment, and completely ignorant of how women learn the best, which is on their time, at their speed, when they want to. It also represents piling on waaaaay too much information at once, combined with experiencing a new and intimidating set of sensory perceptions, in a foreign and alien environment. It's waaaay too much at once for most people.