It is impossible to be more compatible with an 040 than an 040, any deviation from an 040 makes it less compatible. It might run software that wouldn't run on an 040, but that is a different thing. oxypatcher/cyberpatcher/etc already solved the problem of emulated instructions years ago. So being more compatible in your sense isn't even true.
I've many years experience in emulation and one of the things I've found is that it sounds great to make one thing emulate more than one thing (i.e. a cpu that can run 030, 040 & 060 software), but you eventually run into problems and split it out. Or at least you do if you have the source, or the developer with the source cares about your issue.
Not to mention the lack of an FPU and MMU makes any software expecting either crash. Also the piles of old games which don't require either which crash on the Vampire.
