There are several folks stateside that could re-regulate a DR, BUT it would far outweigh the cost of the rifle. Soldered rifles are about $800 IIRC but brazed would be much more to re-do.

IMO, Either live with what you've got and enjoy it for what it is or upgrade to a different DR.
Sabattis and breech loading Kodiaks are next cost ways and Chapuis are up the list a bit.