If you're willing to play around a bit, find the .adds/koreader/frontend/device/kobo/device.lua file, and replace these lines:
https://github.com/koreader/koreader...ua#L1006-L1007
with:
Code:
elseif codename == "cadmus" then
return KoboEuropa
It probably won't work, but who knows, it just might.
You could try the same thing for several of the older models (going up from the bottom), but presumably the Elipsa is the best bet.