Ok, If you must design a new boat.
Why would you start by developing a mast base that has poor repeatability in the home build arena. Glue seems like a bad idea.
If the boat remains a take apart as discussed then why not sleeve your pod(mast base). Slide on the front cross bar and then pin it.(does that make sense?) No bending required.
Just coping and a weld.
You could actually have mast rake adjustment if desired.
It could also be all aluminum if in a fresh water application.