I've purchased some vg ebony and bone bowlback bridges from a nice fellow down in Florida, Roy Johnston, who makes them. #I can pass along his contact information if you are interested, send me a PM.
I agree with Martin on this. It appears to be a modest American bowl in quite decent shape and worth getting playable. My limited experience has shown that these can be quite delightful in sound and playability if the necks have remained true (as yours appears to.) I have a few old bowls with these inset tuners-they have tended to be of good quality.
I'd seek some sound advice on the fret realignment. I've gently tapped some loose ones into place, but also have had to pull and resituate others. The pros here should have #more experienced advice. Paul, John, Rick etc. are HOF types and extremely generous with their contributions.
The standard stump speech requires caution on string gauge. Extra light strings would be the safe way to go.
If all goes well Jim Garber can swear you in to the Loyal Order of the Bowl.
Ever tried, ever failed, no matter. Try again, fail again, fail better.--Samuel Beckett