They'll work, they can be unpacked, just note that some of them may contain similar filepath/file names and you may have to overwrite. Best to let something like Wrye Bash handle it. I have all my BSAs extracted and set up as bash installers. Since the vanilla bsas are quite sizely this makes adding/removing them take a bit longer than I'd like, but I don't have to worry about missing texture, meshes, etc due to how wrye bash handles installation order. When I install a mod with bsas I extract them before repacking them into wrye bash.
Back up your archives someplace else in case you change your mind for whatever reason.