Looking help with edit meshes NIF

I’m making a Skyrim VR mod, real-time book reading with interactive animations.

I already have working book reading system from my other mod (Wayfinder Journal) which adds inveractive book with animations and page generation.

With HIGGS now i can detect when the player is holding a book and which one.

I'm just one step away to make it work with every book, but I can't get past, because I have a serious gap in my knowledge when it comes to working with meshes and NIF. I need just to swap the base world book mesh to custom one (same look/shape but with behaviour graph for animations), after manipulations with original nif all books with this mesh in game disappear or don't have collisions. I believe there must be a solution.

Looking for someone experienced with NIF/meshes to advise or contribute. Reply here or DM me if you can help. Or if you know active modding communities where I could also ask for help (discord or forums), let me know.