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Re:Building a Chording Keyboard: Progress So Far by ics on Sunday August 04, 2013 @09:56PM (#6157992)
You might be interested in this[1] which was posted to HN some time ago. iOS is a no-go for this sort of thing for now at least, but I'm unfamiliar with Android. For hardware modules I think the thumbs work very well as a modal control, but on a small touch screen I don't know how it would work.

[1] http://asetniop.com/

Re:Building a Chording Keyboard: Progress So Far by berntb on Monday August 05, 2013 @05:25AM (#6159148)
Thanks! I missed that.

(They should have "Desktop version" and "iPad version" bigger on the page you linked. I browsed a bit before finding those. Can you buy hardware somewhere?)