The latest version of Elements has supported this for several months, if not longer (I think they'd made it work for High Sierra at least, but I could be wrong

The latest version of Elements has supported this for several months, if not longer (I think they'd made it work for High Sierra at least, but I could be wrong about the exact timing.) I use it for both Caps Lock -> Escape/Control and Return -> Return/Control and it's indispensible.