These are only suggestions as most items will be fine for basic approval but you may have to adjust for EIB and Centurion if you want to go apply for those levels. It really depends on your GML (garrison membership liaison) if he/she would require them to be adjusted before approval so I'd check with him/her first as it is ultimately their decision.
Side ab/kidney rivets would need to be removed, then the holes filled with ABS past, sanded and polished, here's a how to thread for ABS paste
https://www.whitearmor.net/forum/topic/42866-how-to-make-abs-paste/ Then check spacing with references and redrill holes.
You wouldn't need a new belt, you could reposition new snaps/rivets and adjust.
Have a look at Tony's build, it's full of great detail https://www.whitearmor.net/forum/topic/35086-ukswraths-anovos-tk-build-stunt/