Nice idea but does not work on my fully up-to-date iPhone 5s. After putting in the code and tapping "Pair" the pair button just flickers slightly and nothing else happens. Tried with two different codes, rescanning the QR code each time.
Thanks for testing. It's fresh of the shelf and I have not tested it with any other than Chromium/Firefox on Linux and Android/Chrome browser on a Android.
Assuming it would work cross device out of the box, because it _should_, was a idea I was comfortable with. I'll make it work.