Quite simply, remember how I showed you how to search to find whether you had more than just one Morrigan morph installed? You basically just drag the file you want over, hit yes to override/rename it, and theoretically, it should work the same way. Getting rid of the other companion characters head morphs, do the same thing with them: search in the overrides folder, delete all the .mor files you have that are the same name, and then just run Dragon Age Redesigned to get your other NPCs back to their original looks. The Isabela mod? I think I know the one you mean-- I don't have it, unfortunately, otherwise I'd email you the zip file with the mod in it. I do have a dark-skinned, red haired Isabela, though. I really hope I've helped you! :)