In order to write \ on a Japanese wireless keyboard we have to use alt+¥. Very very inconvenient actually. Especially with Swift, the use of \ will sky rocket... Alt is bottom left, right of caps, and ¥ is left of delete. You absolutely need two hands for this, and alt is close to caps and ¥ is close to delete so all kind of havoc will break loose from time to time.
Is there anyway to remap this key? Of course I'm mostly using Xcode. Ideally I'd like to remap \ to _ which is left of the right shift. Because _ prints _ both for shifted and unshifted taps, so \ for an unshifted tap would be great.