Ethet, this is a forum to exchange ideas on building our own frames. Why not build your next frame yourself? A track frame with .9/.6/.9 tubing (like the Kaisai 019) is an easy build. If you are not inclined to gather your own equipment, framebuilding classes like the ones I teach are available. You'll end up with a frame as nice as the ones a pro makes. And maybe nicer because you can spend more time with the details.

I'm a bit suspicious that part of the breakage problem of kierin frames is caused by overcooking the joint using brass filer. Some videos of Japanese builders show them getting a joint really hot. In the States we tend to use lower temperature silver as our brazing material. Of course frequent crashes undoubtedly contribute to breakage issues.