I have a similar situation going on. I have a Panasonic Sport 500. I purchased a Vuelta crankset but was unable to find a spindle short enough to accomodate; the chainline was so far off that the front derailer couldn't shift into high gear, no matter the adjustment. I did what I could to find a shorter spindle but didn't have any luck. I ended up sending back the crankset for a refund and put back on the original crankset: crappy not-round steel chainrings.
I am eyeing up some items to purchase. I am curious if I can switch from my cup&cone BB to a cartridge BB. The BB I'm looking at is a Campagnolo Chorus BB. English threads (1.370x24T), Double (102mm). Would this BB fit my bike?