interesting... well the one thing I can say for sure is it's not the radiation. that's type and amount just isn't something that impacts the human body.
the good news is you don't have to put you face on the phone. I use speaker phone at home, and Bluetooth earbuds while traveling. my fase hasn't physically touched a phone in like 10 years. I use a wired headset when making phone calls at work.
Something like this?. There's a few "Gaming" ones on the market, but I'm not 100% sure of how good their drivers are, but almost every Sennheiser headset I've used have pretty good drivers. This is more "Gamer" Orientated and a lot cheaper. If I were in your position, I'd still go for a standard stero headset, but just put it in mono and balance audio to left, mainly because of comfort and symmetry.