Using this for my next build. Could you share more on how you did the activations for 1-handed used? That sounds quite interesting.

It's not super complex. I ended up just modifying the locations of the layer toggle keys. In the default Miryoku layout, in order to switch the keys to a different layer on the right hand you need to hold a button on the left hand. I found this to be annoying since some actions like entering and using a navigation layer can be done on 1 hand.