What Cartridge Manufacturers Will Retip Their Moving Coil Cartridges For A Fee?

Rdk, yes, but, as previously mentioned, SS make MI cartridges. The operating principle is different from that of MCs, making rebuild a much simpler exercise. That’s a real virtue but not what the OP asked.

SS do not make MC cartridges, so far as I know.  MI cartridges are easier to retip.

It's a matter of semantics. Which is to say that nearly all MC cartridge makers will supply you with a "new" cartridge for a fee that is darn near to the OEM cost of the cartridge.  In some cases, the new cartridge may be your original one that has been truly rebuilt.  In most other cases, the consensus seems to be that the maker simply exchanges your old cartridge for new.  Call it what you will (except in the former case, you get back a cartridge with a used suspension, if that matters).