Absolutely, there are gunsmiths that can do a SST to DT conversion.
There's a basic and great way to
git-er-dun if you're on a budget. This method several years ago cost $300 plus shipping both ways. Shown in the below link:
https://parkerguns.org/forums/showthread.php?t=3216
Then there's the deluxe way and the method I'd prefer if not on a budget, shown in the below link:
https://parkerguns.org/forums/showthread.php?t=26013