Saw this article about a software keyboard for typing on glass tablets (iPad, Android) -
which links to a website -
where you can play with the concept using a conventional keyboard in a browser window (click the TRY ME keyboard image).
For various reasons, it doesn't work much with a TextBlade - the main reason being that you need a tenth physical key. The TextBlade only has nine - four on left, four on right, spaceblade. Also the TB wants to interpret most chords before passing them to the host.
But the concept is very interesting - it could provide for a hardware keyboard that is conceptually simpler and perhaps even smaller than a TB. Ten hardware keys wouldn't require multitouch. It could also work without any hardware under your fingers, if some type of glove or rings could sense each finger's press; i.e., it doesn't really matter how you position your fingers, as long as you can play all the chords. You could be typing on a table or rock or your lap or even in the air.
The web-page demo is tricky using a legacy Apple bluetooth keyboard. Some of the three- and four-finger chords don't register robustly, e.g. the "Devil's Horns" chord (pinky and index finger of both hands) to switch between alphabet and numeric layers. Here are pictures of the 'standard' chords for these layers:
I haven't yet seen how they handle special keys such as Control, Escape, Command/Windows, Option/Alt, etc. Might buy it for my wife's iPad to play more.
Has anyone used this? There was a posting here about it three years ago, but I think the iOS & Android software keyboards have only become available very recently.