(UPDATED w/pictures) "Vostrostone" or similar Bluetooth keyboard cover?

While I like it overall, the lack of a Tab key is driving me mad, particularly when filling out forms. Type, reach up and touch the screen, type some more, reach up to the screen again. Ugh.

Still, for the money it is a useful addition to my kit, if I'm not expecting to type more than quick notes.
 
Does Ctrl-I not work as TAB key?

No, it does not. Tried every Ctrl-character option.

I did a little exploring, and discovered that Tab should be Key 15. The mapping for this keyboard skips straight from 14 to 16.

Been trying to find a way to map some other keystroke combinaiton to Key 15, but have not stumbled across a utility yet.