I had the same bike with the GPM cranks from around 83. would never have dreamed of drilling a brake hole in the fork crown. track bikes designed without brakes are just that, track bikes. any old bike can be transformed into a fixed gear. you know, with a flip flop rear hub. there are some nice fixed gear bikes out there right now.
that bianchi is for the track. the track bikes i saw drilled for a front brake were always the ones that had buckled due to being endoed.
ride it safe,
jason in snowy NYC