I'm not southern either, I'm from Central Florida [0] and we use Y'all often. I believe in your ability to use Y'all too! Embrace Y'all :)
[0] There's a joke in Florida that the further north you go, the more south you are. The further south you go, the more north you are. It's 100% true too.
It is only once I hear y'all from woke people that I start to understand why people dislike so-called "cultural appropriation". It is cringey and weird-sounding to me. And also if you were to speak to these same people saying "y'all" in any southern accent you would be seen as uneducated.
[0] There's a joke in Florida that the further north you go, the more south you are. The further south you go, the more north you are. It's 100% true too.