My sympathies. But at least you're still here to receive them, right? That's the attitude.
There are some solutions available to map keyboard commands onto a foot pedal. Since the WASD stuff is about movement, pedalling might be a more physically intuitive way to go than thumb work on your "look and shoot" hand. You could then map other gaming controls typically assigned to the LH (weapon, spell, potion selection, etc) onto a thumb controller.
Worth a bit of research on pedals I reckon. Good luck and let me know how you get on.
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