That's still a pretty small number of champs, and most of them don't need it that bad. Ryze is still ranged and has crazy CC on top of that, Cho'Gath generally builds tanky or at the very least has a lot of HP, Swain is also still ranged, like Ryze, as well as being beefier than most mages and having decent healing with his ult, Kennen too is ranged and has good CC. Ekko has a bigass shield, stun, and his ult to get away on top of healing.
I could see Kassadin and Fizz making use of such an item, but at the same time they're both two of the slipperiest dude in the game, Kass with his ult and Fizz with his troll pole.
In the end though, all of them could just build a QSS if Zhonya's isn't enough to get them out of trouble. It's not like AD champs have a similar option they other way around. There's no mini-Zhonya's to build to get the active cheap without wasting stats.
Cleanse is an option too.