I've been thinking a bit about this. What about a redesign of how monitors are viewed? Sitting at about 30-45 degrees just behind the keyboard might make sense here. I haven't actually rigged up anything like this, but that makes the most sense to me.

>My understanding is the correct, ergonomic distance your eyes should be from a monitor is about 1.5x the monitor's diagonal measurement. With 22" or 23" monitors, that's too far away for me to reach the screen at all, let alone work comfortably with one using touch.
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>For comfortable manual use, you really don't want a touchscreen to be any further away than your keyboard or mouse. That implies the maximum useful or ergonomic size for touchscreen monitors is actually pretty small.