Hi All,
if nobody mentioned it already (sorry I did not read the entire thread), south of France, Cavalaire sur Mer is a good location. Aldo Ferrucci, TDI instructor trainer has his headquarter and diving center there for (almost only) rebreather dives. He is instructor for several units (rEvo, Divesoft, JJ and others), so you can get support for your unit. O2, He and sorb are available. Several wrecks in the area. No problem for rebreather dives, as long as you have a valid and recent medical certification. I do not have a webpage link, but you find Aldo Ferrucci Rebreather Training on the major social media.
Beautiful town, dives and a great specialized support for this kind of dives.
Cheers