Really great advice from Dezza and Toni. The only thing I can add is undo/loosen the bolt while in the triple clamp.
as Dezza said the damper rod normally have shaped recess.
I have been in the same situation on a set of GSX 750ET (1980) forks. But the damper rods were just round.
I used a sharped broom handle and a big hammer. One hell of a bodge but it worked for me.
also I manual impact driver can help, may just shock it free.