Meh… I’d rather just force the font-family that works. When I refresh to ignore the custom style, most of my buttons, etc., are unclickable. I actually find that rather annoying, though it may be helpful for some specific custom CSS issues like *{display:none;} being added unintentionally or something silly like that.
This doesn’t specifically address the cursor placement issue in .admin-container, fwiw. Can I force the cursor to display in the correct location?