Missing keyboard shortcut for double tap and hold on iOS

I noticed there is no keyboard command for a double tap and hold toggle. On some buttons like the record button in messages, and whatsapp, you have to double tap, hold, record the message, take your finger off the touch screen. But there is no way to do this with keyboards like orbit reader20 display or, orbit writer. So could all of you write to apple accessibility and request a double tap and hold toggle for keyboards? This may be useful for students who need to record for some reason and want to keep their hands on whatever keyboard they are using.