Do you know for a fact that Autogas fittings are universal worldwide?
I suspect even if so, you'll still need to build up a collection of adapter fittings.
The USA rosetta stone is the consumer 20# "BBQ Bottle", its valve spec'd as
F-POL + 1-5/16" M-Acme
, or more precisely
QCC1 or "CGA 791".
And any tank for consumer use must have an overfill prevention, OPD type valve fitted or they're not allowed to refill.
It is possible to pick up such tanks
full for under $50 and from then on swap them out yourself at self-serve places all over, then
decant back at the boat
into your usual bottles, **if** you have the skills, safety
knowledge and proper adapter fittings.