From our friends in Europe, it looks like Tesla plans to offer a secondary upgrade that replaces the analog tuner with a replacement digital FM or FM/XM radio. This may be available as soon as mid-October. We don't know the price or final availability. It seems the upgrade can be done with the MCU2 upgrade or after the upgrade. Here's my list of various radio options with the upgrade: https://teslatap.com/articles/mcu-upgrade/
Hopefully, this will apply fleetwide. Note that there is no chance of getting AM radio, as Tesla has never made a digital AM radio module - they only made a digital FM module and an FM/XM module for North America. I'd expect the pricing may be cheaper if the two upgrades are done together, as it would save some labor. Hopefully, we'll know more in 4 weeks or so.