Well, there was/is/maybe a local Ti frame builder that I only found out about after I ordered this bike. He shut down during Covid because he couldn't get the components to finish a bike. I looked last night and his website is still up and running so he may be back in business. I'll reach out to him to see if he can replace the insert and what it might cost.
In the meantime if anyone can show instances of frame failure on a TI frame caused by this defect. I would be interested. My Google search didn't turn up much. However, I did find one place that apparently fixes TI frames -
https://www.ticycles.com/repair