Lou pointed out that one can change forks and use a fork drilled for brakes
and not screw up your vintage track bike forks. Seems to me there was also
a thread a couple of years ago on how to mount a bit of wood or something on
the rear to accommodate a brake that does not screw up the integrity of the
vintage frame, also...I'll wager it can be found in the archives.
If a rear brake only will meet your needs, you're in business.
Tom Sanders
Lansing, Mi USA