Keep in mind that Camping
Gaz is butane, not
propane. I think you will find that it is near impossible to get refills.
Even though you won't like the idea, I think you're best off
buying a couple of US 8 pound cylinders and store them lashed somewhere above decks near your gas locker. If you plan to stay out of
Europe for some time, I would advise aluminium cylinders; if it's just for s short while, get
cheap steel. There are also small "barbecue" bottles that normally screw into the BBQ-regulator directly. Those would fit your locker and there are adapters available to connect them.
BUT... check your
stove documentation. My
stove came with two sets of nozzles, one for
propane and another for butane.
cheers,
Nick.