Keep in mind that those GUE-trained buddies might be happy to dive with you know (on I assume simple recreational profiles) but might now want to dive with you later on more complex overhead dives, if you go with substandard training. People get very picky once the diving gets real
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What you could do is look at a bit deco diving in the ocean instead of cave - you will be able to get good training locally, it doesn't need to be GUE T1 and there would be less travel involved. Less travel and diving locally means more money for the actual diving. And then look at cave a bit later once you earn more.