Well, you're either using a cell phone or a computer to type your responses, so you are getting as much or more non-ionizing radiation than you would from bluetooth. And that phone or computer runs on and/or charges using electricity, which is also a source of non-ionizing radiation. I assume you likely have or use a wifi network, or are in a location at times where a wifi network is present, which also presents non-ionizing radiation.

Oh, and non-ionizing radiation is not harmful to humans, and especially in the levels present from bluetooth. But hey, you do you.

You would need a usb cable that plugs into the usb port in your truck, and the other end would need to be whatever plugs in to your phone. If you have an iphone, it would be an iphone cable, or aftermarket cable with a lightning plug on one end. If you have anything other than an iphone, you would need a usb cable that plugs into the usb port in your truck, and the other end would need to be whatever plugs into your phone (micro usb, usb c, who knows what else is available). Only you know what kind of phone you have and what kind of cable it needs.

 

There are antenna bypasses like this one.
You insert it inline with the antenna and select a frequency, then when you turn your radio to the set frequency it outputs whatever you've got connected to it. I think they have RCA and 3.5mm input. Had a CD changer back in the day that used one.

There are also FM modulators that broadcast to the radio but if you're trying to avoid any kind of transmission waves in the vehicle I guess it wouldn't be for you.

 

OP, what device are you wanting to connect the aux in? Just curious.