Ah, colloquialisms. Y'all is definitely plural yes, but I've heard "all y'all" in reference to not just a group, but a group of groups...which by definition, all y'all would be.
Alla y'all just sounds Muslim, sorry.
When in doubt, you could just use what we did: "yous."
Hello dere. (Working on my online Marty Allen impression.)
Introduce yourself!
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