It worked really well! The biggest downside was that I had to use modifier keys on the same keyboard as the key I was modifying. e.g. right shift and l to get a capital L.
That keyboard you have in your left hand is one of my favorite keyboards ever, as far as non-standard layouts go, anyway. I just love how it fits over any laptop keyboard for ergonomics on the go.
It worked really well! The biggest downside was that I had to use modifier keys on the same keyboard as the key I was modifying. e.g. right shift and l to get a capital L.