Building a Keirin for the road

Hey, I don't really contribute much here but as I'm in Melbourne thought I might pitch in my 2 cents.

If you keep your eye out on eBay and NJS Export they sometimes have NJS "Track" frames which are drilled for F/R brakes, as well as having cable guides for the rear. As well as occasionally bottle cage mounts and other braze ons. Another option is scouring Yahoo Auctions, but you'll need a little bit of Japanese reading skills as well as a friend in Japan or be able to use a proxy service.

This is what I ride, as a single speed. Its one of those custom Panasonic frames but for road use http://cycle.panasonic.jp/products/pos/custom_order/2014/fpc16/#step&2 . I picked this up the frame for ~AU$60 off Yahoo Auctions as Japanese frames/components aren't worth as much over there, especially second hand.

Oh forgot to add some things.

• Adding a new fork will probably mess with the geometry of the frame. The forks rake and distance from axle to crown (Forgot the term) will alter all the angles. But not a huge issue.
  
• Carbon 1 inch track forks are hard to find. Especially threaded ones.
  
• You will need a new headset going from 27.0 to 26.4 crown race. But that's only ~$100.
  
  
  

I'd say get one of these from the link below:
http://www.njs-export.com/search?q=drilled
Save money on a fork, save money on a headset, looks good and can always change it to a single speed when you get inevitably tired of riding fixed.