Solved. So, it worked on a fresh installation.
Comparing side by side with a new installation I stripped down all diferences in files till they got identical. But the game still wouldn't launch on the old install. Same amount of bytes, dates, everything. The only thing left was that my old psobb.exe was set to compatibility mode for wxp sp2, turning it off solved the problem. So whoever wants to try this, remember to turn of compatibility mode on your .exe, including any launcher, cause child programs will follow parents rules, or smthg, idk, I'm nor a coder.
It feels silly that compatibility mode was the cause for it not working, I guess checking the basics is always a good start?
And OMG this stuff is amazing, it's SO MUCH BETTER than the first version, MXAO looks so much better. Thanks again Zaba for putting this out for the community! Idk how many cares about this, but I love this s!ht!