Even better, I repurposed C-z as the prefix for all my custom bindings. That's got a couple of advantages: 1) I don't have to worry about finding free binding

Even better, I repurposed C-z as the prefix for all my custom bindings. That's got a couple of advantages: 1) I don't have to worry about finding free bindings under C-x, C-c, or at the top level. Those spaces are pretty crowded with out-of-the-box bindings. 2) C-z C-h automatically gives me a nice list of my custom bindings. (For the very rare times when I actually want to suspend Emacs in a terminal, I don't mind typing out M-x suspend-emacs RET.)