I don't use it but this mod has some of the functionality you are looking for (Project Proteus): https://www.nexusmods.com/skyrimspecialedition/mods/46620
When you say clothing physics work for your character are they the same outfits you expect to see with physics on the npc's? Physics clothes need to be built just like the physics bodies, did you build the clothes they have eqiupped in bodyslide?
For future reference if you want to extract nifs from the archives use the mod Bethesda Archive Extractor (BSA and BA2): https://www.nexusmods.com/skyrimspecialedition/mods/974
When you start up Skyrim SE are you starting it via MO2? If you start it via Steam the mods are not applied as MO2 uses a virtual file system that it loads itself.
Take a look at this post, they had an issue with immersive creatues which I see is in your load list. https://forums.nexusmods.com/index.php?/topic/10601663-all-npc-are-not-hostile/
Are you a thane of falkreath and you bought the land? (Workbench is not there by default at the start of a game). The questid is BYOHHouseFalkreath (you can try setting it to different stages and see if that helps at all).