Thanks for all the comments and suggestions. I really appreciate it.
An update:
So a few days ago (after having been turned away by a couple local framebuilders: one didn't work in Ti and the other was so busy he told me to call back in 6 months), I left it with the local bike shop that seemed enthusiastic about taking a crack at it. Today they called and told me that they managed to move the non-drive side seat/chainstays without too much difficulty but the drive side was much less flexible. They've taken a break until tomorrow and they were going to try to investigate why that might be the case.
I'm frankly rather surprised it was moved with not too much effort (I got the sense that Ti would be a monumental pain to bend) but also how one side would move more easily than the other. Should I be worried?