Cheap, but almost effective

[ds20prefecture]

Bought a cheap tape Bluetooth 5.0 adapter for the Sympnony in my '01. It's £16 off amazon, and works really well for audio streaming, less so for hands free. It's a bit fiddly and you have you charge the "tape" occasionally but if you want to keep it stock, it's a decent enough option.

https://www.amazon.co.uk/gp/product/B093BY6QYH/ref=ppx_yo_dt_b_asin_title_o00_s00?ie=UTF8&psc=1

 

[BearMcPear]

That looks pretty neat. Do you know how long the battery life is roughly?

 

[ds20prefecture]

it claims 8 hours of playback, and you can't charge while in use. In practice it lasts about 3 days. I don't know why they don't use the tape spindles to generate the required power
Actually, at low volumes, the tape spindles are clearly audible so if sound purity is what you're after, you're probably better off with quiet room and some headphones