modified your script slightly. it now shows the keyboard in the dialog.

bluetooth icon turns blue momentarily when i click on OK
then it goes back to white.

however,
1) i see a mouse cursor now when a text field has focus
2) when i tap on keys on the keyboard, the bluetooth icon turns blue for a while

a bit more testing and now the bluetooth icon is permanently blue. didn't do anything else other than jam on the keys of my ThinkOutside keyboard a bit more and ran a few more apps.

but i still don't see any keyboard input.