@bonz, on the BT transmitter, There is a company in Florida that makes a BT unit that goes in the panel at the rear of the console. Think it was $160. It also has a aux port built in and is an exact replacement for that panel. the unit uses the factory plug at that panel to power the BT and mine works spectacularly.
Be careful when putting it in, follow directions and not horse it like I did. Broke a tab. I also ran a aux plug to my satellite radio, which is a little rectangle dash mount.
On google lookup LRBT-1
Here's the link: for British American Concepts
https://britishamericanconcepts.com/product/lrbt-1/
Get the external mic from Amazon
The only issue I had was that when you plug in the aux cord, BT gets grounded out. But I hacked it by soldering wires that by passed this and now I can leave my little satellite plugged in and get calls on BT in stereo.
Should have taken pictures but that would have been evidence and voided the warranty. Opps guess the cat is out of the bag now.
Love mine, GPS from phone over BT, while listening to the sat plugged in had to be done. One day I have to fix the vents on that panel when I do I will take pictures of the ground wires that cause BT to ground out when aux plug used to bypass this feature.
Here's the install video:
Seems pricey until I reckoned I had spent $30/ea on other solutions and canned all threee cause they sucked, then found this.