I worked at a restaurant in Ohio in the early 2000s. Had a group of ladies come in once, probably in their 50s. Got super offended when I gave the standard "hi guys!" greeting. However, where I grew up, that had become a gender neutral greeting.
If you want to remove gendered pronouns entirely, "y'all" is what I would go with. I think the UK frequently uses "you lot", but that probably does not sound great to most in the US. I suppose "folks" is one that might work, but seems to rub some people the wrong way.