Yeah, you can, as you have connectors which allow USB-C pass-through on top of the 3.5 mm.
Another alternative is 3.5 mm to Bluetooth adapter from your headset. Though those are usually (?) male, and hence only work on a female 3.5 mm.
You can buy these for a couple of EUR/USD on Amazon from any Chinese brand. Fairphone themselves also sell a 3.5 mm to USB-C adapter. But this does not have USB-C pass-through.
These all do have a disadvantage: physical bloat / potentially making device less comfortable.
The Qudelix 5k is a pretty well liked 3.5mm to Bluetooth converter in audiophile corners. I've been using one for ~2 years now, it does a pretty good job, plus, retains the option for plugging in via USB.
Another alternative is 3.5 mm to Bluetooth adapter from your headset. Though those are usually (?) male, and hence only work on a female 3.5 mm.
You can buy these for a couple of EUR/USD on Amazon from any Chinese brand. Fairphone themselves also sell a 3.5 mm to USB-C adapter. But this does not have USB-C pass-through.
These all do have a disadvantage: physical bloat / potentially making device less comfortable.