Sorry to hear about your accident and Ihope you're feeling better. Protective gear ofsome kind might not be a bad idea.
Before I accidentally put the phone to my bad ear, I'd tried holiding the receiver to the abutment, as the instructions trhat come wiith the processor say you can. I found it squealed and whistled, just as you thought it would. If you hold the phone to your ear loosely and not cover the whole thing. but don't touch the processor, it will pick up sound. I've done this quite a few times purposely to perfect my technique. If you're on the phone with someone who speaks in a low voice, it doesn't work though. Just the same, it's an amazing exerience.