Statesman

So to add support to mods that overwrite are, wed, tis, pvrz and bmp files; are/wed files should be patched...but am I to assume that mod-added areas that do not overwrite basegame files would benefit from this mod?

While I do believe properly made portraits are superior, it is unfeasible to rely on volunteer work to tackle the quantity of art required for a PPE overhaul. IMHO OP, assuming you have the equipment to handle it offline, you should reconsider using Stable Diffusion. Even relying on pre-trained LORAs (like this one), you could get quality portraits once you have your setup ready and get used to prompt syntax. The good thing is that once you get the grasp of it, you can also use other images/portraits to iterate similar but different versions Sorry I can't be of more help, haven't played BG1/BG2 yet (here for the mods) and I've got no personal experience using SD (just a few friends who dabble in it).