The OP wants to carry in deep concealment
in a non-permissive environment
. He defininitely doesn't
want a multipurpose holster that is larger or less comfortable than is absolutely necessary.
While I'm a big fan of Raven holsters, which are very versatile, I definitely wouldn't recommend one in this case; my Raven holsters when worn IWB are decidedly less comfortable than many other options, and less comfortable
means discomfort, touching and adjusting, and - as a consequence - less concealment.
is where the OP should be looking.