Switching keyboards

Can anyone clue me in how how to change keyboards while I’m editing in Scrivener iOS?

From time to time I need to use a Greek or Hebrew keyboard in my work. When I’m using the iPad’s built-in keyboard, switching from one to the next is fairly simple. But I use an external Bluetooth keyboard (BrydgeAir) when I’m working on my iPad.

At the moment the only solution I’m aware of while in Scrivener is to switch off the BrydgeAir keyboard, then use the iPad’s built-in to switch to a different keyboard. It would be nice to avoid having to do that.

Any ideas?

Color me stumped.