I think it's possible, the question is whether it would be used enough for namida to implement it.
A while ago, I asked whether we could enable custom backgrounds for every level menu screen, i.e. make this another property that could set on a level basis rather than on a per-pack / per-rank basis. So it would have been something you decide for each level, just like music, theme etc.
There weren't enough people interested in using this option, that's why it wasn't implemented, but as far as I understood namida, in principle it wouldn't be too much effort.
The reason I requested this was to be able to use different level menu screens depending on the tileset used, like in Lemmings 3D.