A solution to NOT drill your track forks and have a normal front brake nonetheless

different fork: there are a gazillion reasons why you want to keep your fork.
drill a hole: no.
keirin removable brakes: large, bulky, just not nice
drum brakes: no.

I do know a better solution than the keirin removable brakes which many in this thread already liked and welcomed, I will test it, I will share the experience.

Finding a fork that have the same (or similar) rake as the current one you have isn't diffcuilt, or his name isn't Hillary Stone.

drilling a hole is always an option.

keirin brake - just not nice for what? AFAIK, it work, it function just what it said on the tin, and it's removable.

drum brake, not as powerful as road brake, but it's up there with ease of removal.