Why not make your own frame? That is what I did. Just sold my beloved Nishiki Medalist to make room for a new bike, my baby brother had just died at age 33, and I figured, why not? Bought the Paterek manual, read front to back, bought oxy/acetylene set, created a full sized drawing, ordered the tubes needed (had almost complete 70's era 531 tube set from my deceased brother) and lugs from Henry James and a month later was riding a true custom bike that fit me like a glove. You could make your own frame with MAP torch for about 700 bucks usd, including nice paint.
It is not difficult to braze, never did it before that time, and learned without practicing. I just did it. You can too! 20k miles later the bike now sits in retirement and I ride a Ti frame. If I had the money for the equipment I would have made my own Ti frame!