I am informed that the MAC keyboard can be remapped with ease. If you are one-handed I urge you to learn to type. Perhaps you could use my tutor on a friends IBM until you get started. You could probably get someone to give you an old IBM. My DOS tutor work on PCs that are carved from stone. You can learn to type just as well as you could on a MAC or Win 95 IBM. You can print the lessons and practice them without the tutor. People learned to type with typing books for many years.
You can make a bootable disk, put KEYB.COM, DVORAK.SYS, TU.EXE, and all the little lessons on it, and go to any old IBM computer to practice typing. I used to go to the school library at lunch because I had no computer in the classroom that I could use. That is why I put in the feature to cut off the sound.
My tutor does no more than introduce the keys in an order that is nice for the single-handed typist instead of for the Qwerty typist. If there is a single-handed typing tutor for the Mac I do not know about it. I learned on a regular typing tutor (TT101). You can too.
I have reserved this spot for links to MAC sites with information or help for single-handed MAC folks. They need love too. email me.