FYI, the12 mini is noticeable smaller than the SE2 and slightly bigger than the SE1 but with bigger battery.
I´m on the same situation as you but with an iPhone 8, I´m not planning to upgrade anytime soon if I can avoid it, but the "mini" would be my go to if needed.
You are correct! I was confused by the difference between screen sizes, but the 12 mini is all screen and the SE2 has bezels.
Thanks for the tip.