I plug a bluetooth receiver ($8.00) into the saddlebag USB. I put my Iphone in the left front cubbyhole with Pandora playing on the phone thru bluetooth. Using the AUX setting on the radio I can use the handlebar volume and skip switches on the handlebars.
Here is the USB Bluetooth Receiver that I use.

https://www.amazon.com/dp/B00SATN9J2/ref=dp_prsubs_1

They get their power from the USB plug in the saddlebag.
I can also charge the phone in the front cubby while still using bluetooth for tunes.

Has been working for years now.