Broke down, pulled the CD changer and fitted a GROM USB2P. Found a mouse nest under the changer!
Now, if I can get the factory mic sorted out, I can fit a Bluetooth hands free like the 2013.
I also have to get used to the quirks of the USB music player and what it will/won't play also how many tracks per folder. The instructions say one thing but the unit has a mind (and a lady's voice) of her own.

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2021 X5 xDrive40i
2015 X5 xDrive35i MSport
(Traded) 2013 X5 xDrive35i