I've decided to give it a go..
Rear Derailleur: 8 speed shimano 600 tricolor ultegra, currently shifting with a 6 speed casette and with shimano 105 6 spd index shifters.
Rear hub: FH-1051 shimano 105, currently running with 6 speed casette but I believe it can adopt 7 spds as well, only uniglide type casettes are a bit hard to find (esp. if you want it to be 11-26 or something like that)
and the campagnolo part either can be Rgo brake shift leverz pre-1999, 8 or 9 speed. I believe the 8 speed should work better, esp. with 7 spd.
The only issue is the casette spacing, which is I believe 5.5 mm-s instead of 5... but with 7 spd, it'd be corrected, that'd have exactly 5mm spacing.. then the cable movement, the campashifter would pull more cable than the required, but fortunately with the trad. hubbub method I should be able to slightly decrease the cable travel with each click.
Then bang, the system should work, not to mention that you can always adjust the end-limit screws on the rear derailleur to avoid "shifting into the spokes"... too bad the chain on my bike is so short that I could never shift above the 3rd ring