Yeah I did this for a DV cam and needed two adapters: USB C to the old DisplayPort form of Thunderbolt, and then that to Firewire. And even that wasn't complete, because I needed to adapt to the smaller Firewire port on the camera.
Obviously they could make a single stage adapter but I didn't find it if it exists.
Obviously they could make a single stage adapter but I didn't find it if it exists.