Not sure, these Crankshaft rebuilders have the capability to weld up a crank and turn it to size again in specific areas.
It is easy for them to turn them down on the rods and mains for clean up, then use over size bearings. That rear main seal area I bet they can repair that included in the same process/price as part of their service.
They have to deal with all kinds of crankshaft issues, cars, trucks, semi tractor diesel engines. They are not going to toss out an expensive crankshaft just because the seal area is bad.