for the sort of stuff you're talking about, you're going to probably need to go with phil wood's options. they still sell french threaded cups that are compatible with all of their cartridge systems. that's going to be cashmoney, but your best bet for getting a french-threaded system to mate with any crank you throw at it.

that said, i have a set of french-threaded sugino cups that i was able to come across with a sugino 75 109mm square taper spindle. it's extremely smooth with phil grease and high quality bearings.

chances are that you can clean and reuse your current cups and replace it with a shorter spindle so that you can use sugino or other square taper track cranks. if you can give me specific information, i would be more than happy to help you figure out exactly what you need to buy, etc.

good luck.