Developed RSI and recovered by seeking professional help (occupational therapy), finding the physical/mechanical cause of the problem, and addressing it through massage (intervention) and steno (preventative).
A 1:many chord-to-output mapping makes far more sense than a 1:1 key-to-character mapping, especially from an ergonomics perspective. For example, pressing the chord for TH-S (three keys, single press) for 'this is' is obviously more efficient than making individual motions for 't', 'h', 'i', 's', '_', 'i', 's'.
If you can learn to program, you can easily learn steno.