I understand that it is not the original, but I am hoping it will sound better than any cartridge I could get for under $500.
Why do you think so ? Last year i’ve bought on ebay Dynavector 23RS MR with Ruby cantilever NOS and Dynavector KARAT 17DS MR with Diamond cantilever for about $500 each. Diamond is the most expensive and exotic cantilever. Both carts are fully original, both with MicroReach tips. Both are LOMC made in the 80’s.
The quality can be superb even for a relatively low price, you never know how cheap you can buy unused vintage cartridge online.
Instead you paid $500 just for the cantilever/stylus and repair fee. Of cource it’s up to you, but the price for repair job and materials is equal to the price of the new cartridge. I have no idea why people think that $500 for repair with third-party parts (not the original) is cheap in this case?