https://www.goodreads.com/book/show/956297.Trance_Formations
https://www.goodreads.com/book/show/447454.Monsters_and_Magi...
If you're going to learn to operate your bio-computer, please don't stop at typing faster, eh?
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One of the basic "exercises" or "techniques" that people often do with (self-)hypnosis is to set up a simple binary yes/no signal from the subconscious mind to the conscious mind, e.g. a finger twitches for yes, wags for no (non-response is a kind of "does not compute, please rephrase" message.)
From there you can "leverage" the connection for more structured communication. E.g. the Six-Step Reframe algorithm https://gist.github.com/calroc/4719702 (deprecated in the 80's BTW.)
In re: these chorded input devices, the basic idea is that you set up with your unconscious motor programs to wiggle the chorded keyboard the right way, letting your conscious subjective experience be that of "pouring" your words from your inner voice (or imagery) directly to your machine.
Once you've got good communication with your subconscious mind, it's pretty easy. I used to do it w/ a just a Dvorak layout.