Soldering silver bezel cups on Titanium

Nope. I have a Ti solder pick on my bench because solder won’t stick
to it. Welding is the only way to get this done and that will be a
compromise. Maybe Jim Binnion can give us some insight to the nature
of Ti / Ag mixture. I would suspect the edge of the heat effected
zone would be highly unstable. Capacitor discharge, TIG, and laser.
Any weld will need an argon cover. All of these solutions can be
subcontracted. Otherwise make a mechanical connection. I suggest a
silver tubing rivet with a key; like on an onyx with a plate on top.
This is probably the safest solution. Depending on the state of the
Ti you may find it difficult to drill though. You might have to drill
it with a diamond drill. Here is an orchid post concerning annealing
titanium.

I wish you the best.