Hmm. Isn't the cellular/WiFi transceiver in the PinePhone an SDR? Isn't this the only reason other manufacturers have included FM band reception? If so, couldn't it be programmed to receive that band? (And other such bands)
If not, find yourself a really small FM receiver of your choosing, and glue it to the back of the phone. That's simpler than integrating new hardware into the phone.
If not, find yourself a really small FM receiver of your choosing, and glue it to the back of the phone. That's simpler than integrating new hardware into the phone.