I agree with ivan. I never tried remodelling for exactly that reason. If you are quick at doing that stuff then it is a viable option, otherwise a whole new battlefield…
Another approach would be to try and get texture on the wall that has none to begin with. One option would be by projecting a pattern onto is, another to stick stuff on it, either lots of small stickers or larger things like newspaper. That would mean two sets of images though - one for the geometry and the other for texturing.