There are better cartridges even for $500, i paid same price for my Dynavector KARAT 23RS MR Ruby in NOS condition for example. There are many options for MC or decent MM for the same price.
SoundSmith will have to open your cartridge, sometimes it means to break the cartridge and glue it back (not sure about Sumiko). Not sure why do you need all these damage if you’re not even sure he can fix it? Fixing coil is not cheap at all. Reparing coil wire is actually very expensive. Are you sure he can do that in 6 weeks? I think your cartridge will be inspected in 6 weeks. But It can take 3-5 month to fix the problem.
SoundSmith will have to open your cartridge, sometimes it means to break the cartridge and glue it back (not sure about Sumiko). Not sure why do you need all these damage if you’re not even sure he can fix it? Fixing coil is not cheap at all. Reparing coil wire is actually very expensive. Are you sure he can do that in 6 weeks? I think your cartridge will be inspected in 6 weeks. But It can take 3-5 month to fix the problem.

