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Frogpad used to make a nice (i never used it) one handed keyboard.

There have been some chording devices - "The Twiddler" is one. https://youtube.com/watch?v=QG3SPSzWUv4

Sadly there are a bunch of patents that hamper innovation and experimentation.

I'm typing this on a Frogpad now. Due to an injury I've used it as my main keyboard for years. Unfortunately the company is all but defunct and the layout is propriety. For years I've been meaning to write script to set the keyboard layout of a full size keyboard to it. That way I can stop paying hundreds whenever an old Frogpad appears on ebay.

I really wanted to try out the frogpad back when it was first released, but never bought one. If you handled the chording in software I imagine it wouldn't require wiring very different from what people use to make regular DIY keyboards: http://cubiq.org/build-your-very-own-pc-keyboard Given the heavy use of chording in a one handed keyboard, I'm guessing Topre keys might be a better choice than any Cherry MX variety.

Have you tried the cykey keyboard, from the original inventor of the Microwriter keyboard? I got one in 2012 but don't use it much.

Still on sale from http://www.cykey.co.uk/

Or, if you PM me I can send you mine for postage because I don't use it much.

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