Normally people refurbish MC cartridges with SoundSmith, except for a few very popular vintage MM models where the original Ruby cantilever was an option from the manufacturer back in the day. Grace cartridges for example. There was an original Grace RUBY and SoudSmith upgrade is also RUBY (with different stylus tip). This is OK.
Your Clear Audio has Audio-Technica motor inside, you want to upgrade Aluminum cantilever with Sapphire cantilever. Maybe it will be better, maybe not. Why do you want to keep using Virtuoso (even refurbished) ? Did you try to compare this model to anything else ?
There are Clear Audio cartridges with Boron cantilever, maybe you can add Boron instead of Sapphire ?
You'd better ask Peter at SoundSmith what is the optimal.
Your Clear Audio has Audio-Technica motor inside, you want to upgrade Aluminum cantilever with Sapphire cantilever. Maybe it will be better, maybe not. Why do you want to keep using Virtuoso (even refurbished) ? Did you try to compare this model to anything else ?
There are Clear Audio cartridges with Boron cantilever, maybe you can add Boron instead of Sapphire ?
You'd better ask Peter at SoundSmith what is the optimal.