Are you taking on new work?
Not at the present time. I stopped a couple months ago because the Pile-O-Boxes was getting too large, and long wait times are stressful for everyone. Clearing the backlog before opening the gate again was the only remedy I could think of.
If not, could you recommend a repairman to do such a repair?
Believe it or not, I can't. None who are active, anyway. There are a couple guys who are getting good at the "collectable grade" restoration thing, but who don't do technical repairs; and I know several repair guys who could definitely return your pipe to service, but I don't know how "invisible" the finished work might be. That's why I suggested making sure that whoever you find who says he's willing to do it be confident and comfortable with the
exact situation your pipe presents. (It looks straightforward, but it isn't).
Having said that, I just realized I've been assuming that you wanted a "best possible result" repair, when maybe all you want is a functional one. (My apologies. Chasing perfection is how my brain is wired.) In that case, I'd just go with whoever gets the most votes from this board (so to speak). There's a lot of customer experience here.