Old bluetooth device not found

I’m looking for a way to connect an old Panasonic SA-PM250 radio to my Fairphone 5 via bluetooth. However, when trying to pair the device, my FP5 won’t find the radio. A FP4, as well as an S23 does find and successfully find and pair with the device. In my estimation, the FP5 seems to not support the old bluetooth algorithm the radio uses. Is there any way to still connect the radio to my FP5?