I've got a lovely 32.5mm chronograph ... I hate to be that guy but "size isn't everything" .
Now, the UG is cosmetically appealing. What I would do is call around my watchmakers and ask how they are fixed for availability of parts for that calibre. I suspect some parts will be a struggle. If you can get a ballpark price then you can work out where you need to be to buy it without coming a-cropper.
After that, it's just horse trading.
Personally, I'd be willing to spend the money to bring that one back.