I've been trying to stay away from using different models for the same character, but I will admit to doing that for 1 girl I found really hot that really only did a couple of dorm videos that didn't go as far as I would have liked. Found another girl who looks pretty similar (both in build and her face) to use as a stand in for a later scene where things go further, but like you mentioned you kind of have to make sure the video is shot from an angle where you can't tell for sure if the face is the same girl.Yeah I found similar problems, I had to resort at times to
- using similar looking models and where their faces are less distinct (looking away or angled etc)
- using some fakes/headswap edited
For the main character I don't even try to maintain consistency. He body swaps constantly to other male actors. I figured the girls are what people really care about. So in my game the MC is played by like 10 different actors who all look completely different but with the exception of that 1 girl I mentioned above, all of my girls are consistently the same actress.