Simplest tailpiece ever

. A replacement wooden bridge for that would be easy to make and you could get the string placement right.
If I lived in your country I’d make you a new blank or at least send you a piece of appropriate wood to make one yourself. Any hardwood could do. Alternatively, you could chisel or plane that top part down a bit and pin and epoxy a piece of bone or metal over top and file the string slots. If you take your time and are careful, you can use a $4 round conical file from a hobby shop to make your slots and “lap in” the slots with old strings and an abrasive like toothpaste or rubbing compound. I have literally done this several times myself. I’m not buying expensive files to use once every few years.
To move the bridge over 3-4 mm would be difficult to get the existing holes plugged and new holes drilled perfectly.