Stripping titanium from stainless steel

If I were a betting man, I would say not very probable. If my boss said try it anyway, I would find some scrap parts and try a 20 parts nitric acid to 1 part HF acid. Possibly 2 parts HF if you are using 50% HF.
This tank will probably get dumped more than you would like, but as metals build up, it will take longer in the tank and the pitting will go up.

I don't believe that there is a chemical method that will strip away the titanium without also etching the SS. The usual nitric/HF mix will strip the titanium much faster than it will attack the stainless so, if you are careful about your immersion times, you may be able to get the job done and only have a little bit of polishing time afterwards. I'd suggest that you start with a solution that is about 35% nitric (by volume) and 2% HF (by volume), then establish your removal rates with test pieces of titanium before you try it on a processed part. Careful, this stuff is highly hazardous. Good luck.

Thin layers of titanium can be readily removed using dilute HF. Nitric acid is not required. Thus you can avoid attacking SS.

Try 5% potassium hydroxide + 5% of 35% grade hydrogen peroxide. This will slowly dissolve titanium and I think not attack stainless.

Alternatively to Mr. Holmes' suggestion, Sulfuric and/or Nitric acid will work excellently. Titanium forms a reddish-orange coordination complex in acid-peroxide systems.