Has i said previously the eurolite fixture do not show up in cuety because the ring is a subfixture and cuety do not manage subfixtures.
I usually don't do custom fixtures for cuety, but i've created this one for one of my own project so I can share it with you. ( I merged it to your user.personality file).
To use the eurolite fxiture you need to patch the 'main" mode at the fixture dmx address and the "ring" mode at the dmx address of the ring. For 23ch mode you need to patch 4 times the ring mode.
I hope this will help you,
Enjoy