On a 2017 MacBook Pro 15", I want symmetry in my three modifier keys (ctrl, option, cmd), i.e. what's available to my right hand would be mirror-symmetrical to what's available to my left. The best way to achieve this would be if I could remap the left-arrow (←) key to ctrl. Left-arrow sits directly in line with my right pinky and I don't use it. Is this possible in iTerm (or another emulator), or at the MacOS level?
(I know for sure that remapping at the emulator level is desirable to me. I'm not as sure that I never use the arrow keys in MacOS more broadly, but I'm sure enough to try it.)
I've seen a lot about remapping keys, but so far only that modifiers can be remapped to other modifiers, and other keys to other keys or macros. Since left-arrow (←) isn't already a modifier, I don't see how to make it serve as ctrl. Or is there hardware or firmware standing in the way?