Custom footwear might indeed be a good call, if a person really understands the dynamics of what they need, or perhaps a foot doctor is involved in the design (?).
I don't see how orthodics would help here, however. I have and use orthodics, but don't see a connection with bunions. Not saying there isn't one (feet are complicated), just that I don't see it.
The combination of the aforementioned wide boots (to accommodate the bunion) and custom orthotics for a good fit was what I meant to communicate. Looking back I wasn't that clear. Izzat better?
What I meant about the cobbler is a good one can stretch here and there to make the boot fit feet better than a common last does.