I have something that used to be a head bolt that I use to spin the oil pump, but its long enough to engage with the pump and connect to an electric drill. You need to take the bevel gear out first though.
One of the engines I've worked on had a thread inside the bevel gear pinion so that you could lift it out, or insert it with more control than just dropping it into the hole...... (but I can't remember what it was)
It must be worth running a competition for the strangest foreign object found inside an engine.