Sorry I can’t help you with Gold Coast shops, but it intrigues me that you’re in Japan and you’re asking for a track bike, when lots of people here would kill for a Japanese Keirin frame:)
See, now if I was in Japan I’d be posting something like; “I am in Japan, how many Keirin frames and NJS parts would you like me to bring over so that I can pay for my trip?”
Assuming this is serious, I don’t know the GC shops, but ndf might be able to help.
… cos i have a 49cm Gitane road frame just itching for conversion
On the GC: John’s Cyclesport on Nobbys beach is an ace shop, but they do pretty much only new stuff. John makes a mean short macchiato tho… so it’s worth dropping in for a chat… Um… for track frames you probably want to go to Brisbane, or ebay.com.au - I dunno.
Actually - you could try Burke’s Bike Barn (currumbin) too… Burke sometimes cruises around on a tarck bike - he might have something. I never went there tho