[wastu]

You can use mouse with usb otg.

[geraldhh]

still have to hit an invisible button

[rom1v]

Once the authorization popup is on the screen, press Tab, Enter, Tab, Tab, Enter (of course, it's more difficult if USB debugging is not enabled at all).

[smusamashah]

Thank you. I haven't tried this either. This sounds very doable. Can try this first in emulator.