Textures are easy to add afterward, if SPM5.0's textures aren't big enough you can just install bigger textures after them in the left pane. I mean, unless Rotten's textures aren't installed through MO, they may still not be. I think non-MO installs always load last. But even in that case they'll be easy to find and delete, they're just pictures.
A complete all expansions game pack of fitting retextures would be pretty convenient though.