It used to be that a variable pin spanner cost $10-$20, and it would fit into the pins of say, any possible bottom bracket. Now for a headset i don't know if the pin holes are all on one horizontal plane, or are perhaps on opposite sides of the outside of the headset (in this latter case the BB pin spanner i am thinking of would not work.)
I'm sure PARK makes variable pin-spanners with replaceable pins in case you break a pin.
- Don