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I bought the holosun for my 43X. I had the slide machined for it at Tropp Gun shop in Gap PA. No adaptor plate. It was $135. If you buy the MOS there they will install it and sight it in for free. Great people.

 

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When you mill your slide- you are committed.

For a real low budget, no commitment route - buy a Aimsurplus (or Brownells, or PSA) slide, already pre-cut, and put your Glock parts into it, then install your RMR footprint optic of choice on it.

You will then have a bare factory glock slide that you can decide what to do with, or return to stock configuration at a future time. Or if you decide you like the optic- then you could sell the slide, and actually come out ahead.

Learning and training to use the floating red dot is not easy for those shooting a long time with regular sights. If you are new to shooting, you can pick it up easier. Since red dots are going to be universal in the future (iron sights will be like clutches), learning the red dot, then learning the iron sight is easier.

I think in the method you mentioned you will need an adapter plate. That puts the MOS up higher. Maybe I am wrong. Mine was machined for the holosun 507.

I am 76 years old and have done mega training with iron sights in tactical settings. It took me maybe an hour of practicing to the point that its as natural as getting the sight picture on the open sights. But one nice thing is when I shoot tactically. I am right there with the iron sight alignment as seen through the MOS. So it the green dot malfunctioned I seamlessly shoot without the dot.