Bluetooth or aux in

[colinrobbie]

Just a thought on this one ........ wouldn’t it be straightforward and no issues with company or leased vehicles to just buy a Bluetooth speaker which could be positioned on the shelf over the windscreen. These are usually charged via usb cable. 
Quality of sound will depend on how much you are willing to pay.

That's how I have been doing it. But doing 70 on the motorway it can be difficult when listening to spoken word podcasts.