Cool idea

It's nice when there are patron rewards that are a little more interesting than a wallpaper that, for me anyways, doesn't usually scratch that VN itch

Hope that didn't sound entitled btw, didn't mean it that way.
I could see this opening up a lot of interesting avenues that might not quite work in the main game. For example, you said that the MC had issues with his mother; if you ever wanted to give the player a first-person perspective of the MC as a child/adolescent/teen and the way his mother treated him, but felt that a flashback would be too corny or something, this would be the perfect avenue

Things like that I find fascinating, finding out sort of what makes the MC or other side characters tick, things the girls do when they're not with the MC, and so on.
This is like 2-3 renders right? Guessing if you were to make this a thing, it'd have to be in the sub-10 render range to make it economical and not get in the way of the main game? Don't know how long a render usually takes to make.