UCPA can be more than decent, I've done it a couple time, on solid some 15 years ago and on split 5 years ago, both times in Argentière (Chamonix) . There are all kind of level up to upper intermediate, but if you're lucky to can get really decent groups. The coach/instructor find really good freeride runs for everybody and the board they lend if you wish too are pretty good (XV splits with Plum bindings...). The food is awful though (but for the price, that's fine), just go eat outside.
I joined an open group at Lofoten ski lodge too, it was awesome... If you like skinning.
Went cat skiing in Macedonia with Eskimo freeride some 15 years ago (open group again). It's a bit expensive and the terrain a bit dull, but still good fun (and a lot of oil). Dunno if they are still in operation.
There are a couple of British guides located in France who seems to run nice open group operations too:
Backcountry & off-piste instruction & guiding in Sainte Foy, Tignes, Val d'Isere, La Rosiere & Les Arcs. Native English speaker, based in Sainte Foy since 2007.
fr.whiteroomsnowboarding.com
Never tried, but almost did (Please don't ask why I had to turn to British guides in France, I'm gonna tilt again).
I'm pretty sure you can find some nice snowboarding lodges with open group all around the Alps.
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