Charlie, I don't think you posted it in the wrong spot at all
How about that Gripper thing, that looks like you could use it one handed, with a set of board buddies....?
A power feeder would the the way to go on most any machine, BS, TS, or router table, shaper etc.
Did this person loose their arm fairly recently or were they born that way?
I went to uni with a gal who was a Thalidomide baby, she had hands coming out of her shoulders, but not arms. She did just about everything you could imagine, and did not let her handicap slow her down, heck she rode a bicycle (with long tall handlebars). She said she was not "Handicapped" but she had "a handicap", a huge difference.
I'm just saying this as I'm always so amazed at how well people adjust to their circumstances, and I'm wondering about this person. I'm sure there are all kinds of things they can do in woodworking with only one arm, they will just have to adapt and over come.
The pessimist complains about the wind; the optimist expects it to change; the realist adjusts the sails.
William Arthur Ward