Yes but there are waiting lists, regional biases, price tags, and personal opinions involved. In the last 10 years more Keirin pros rode Bridgestone, ViValo, and Panasonic frames that the rest combined (almost!).
Also JR races, High School races etc.. in Japan have a different set of geometry rules entirely, compared with those enforced in Keirin. I can get the rules from Kusaka San next time I am in Kobe. Amateur rules are pretty much Olympic rules, as far as I know....carbon wheels/frames etc...