I use a sugino alpina compact on my merckx, it serves me well and looks pretty while doing it!
Not sure if they are still in production...
__________________
1989 Schwinn Paramount OS
1980 Mclean/Silk Hope Sport Touring
1983 Bianchi pista
1976 Fuji Feather track
1979 raleigh track
"I've consulted my sources and I'm pretty sure your derailleur does not exist"