For a 7 string with a slightly shorter scale try tracking down some of the first prs se custom 24 7 strings, they had a 25" scale length.My fingers are past their prime, so I doubt I'll buy another 25.5" scale 6 string. I'd make an exception for a 7 since there aren't many options in short scale.
I also have an easier time playing 24 frets than I do 22 cuz I have this nerve pinching wrist thing that kicks in when I'm playing in higher positions. 24 tends to shift everything forward a couple notches, so that's something I consider
I think multiscale looks funky, and I'd never buy one unless it was used to make stuff shorter and easier to play like a 25-24