Because of interest in converting a Selectric to a Dvorak keyboard, I'm working on refurbishing a Selectric III machine and converting the keyboard. My research shows IBM offered a Dvorak keyboard, but it varies slightly from the ANSI Dvorak keyboard. I've decided to utilize the ANSI Dvorak layout which switches the quote/double quote with the question/slash keys.
Hopefully I will be done in a few days and I'll post it here and the procedures necessary to do the conversion when I'm done.
Here is the machine I chose to convert. I will need a full overhaul first and then I'll work on the keyboard conversion.