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the revo will be the next after the dolphin but in FWI it's too complicated for training and finding helium
It's not so difficult, I lived in Guadeloupe during 10 years and have began my first mixed dives on the island. To have helium, you to the Sogig (or the equivalent in Martinique) and you buy helium. Simple. Expensive, perhaps, but simple.
At St-Pierre de la Martinique you have a dive center wich use helium and rebreather : Papa d'lo.