It's all mentioned in the OP already. I'm not sure what there is to add to that?
It'll work well enough on the Clara HD, Forma and
Libra H2O with a modified version, give or take what @NiLuJe wrote. I assume the Aura Edition 2v2 doesn't work but I don't recall seeing reports either way, and afaik the H2O 2v2 doesn't work for sure.
Unless you meant something like, older than the original Kobo Touch?