1. Revert back to patch 6. Go to steam, rigthclick BG3, properties, Beta's > patch6 and finish your game.
2. You can easily mix and match Nexus mods and Ingame mods (IGMM). I am doing a new run and am just installing everything fresh, mixing old ones, not even patch 7 updated from nexus, patch 7 from nexus AND ingame mods. So far without any major hick ups.
3. Get used to using both Nexus BG3MM and IGMM because not only will Larian not allow some mods, a lot of modders already decided never to use the IGMM.
4. Larian imo is not doing a paticular thing, its just: if you do something with the code, a lot of mods break.