I am also midwestern, and I have a problem with both miss and ma’am. The entire fact that there are two of them (and just the one for men) implies that age determines some portion of a woman’s societal value.
So as a fellow midwesterner, I’m not sure I agree with the idea that this is fully regionalized rather than a vaguer community-based (your church, your town, your parents’ profession, your school system…). I do hear that you want to be authentic to your own values and upbringing and completely appreciate that. But I’d consider whether the point of politeness terms and honorifics is to make you, the speaker, feel like you’re doing the right thing or about making your addressee feel seen and valued. If it’s the second, then you might consider whether it’s worth developing a new way of showing respect that can feel equally authentic in contexts where you may be unintentionally be making others uncomfortable.