What's the best way to use an RD that has a claw on a frame with a dropout hanger?

Assume the RD doesn't have a captive bolt.

Last time I tried this the hangar bolt wasn't long enough to get through the frame dropout to use the nut from the claw to capture it on the other side.

So...

1) Try to find a longer bolt?
2) Thread the nut onto the bolt first then the bolt to the hanger, using the nut as a jam nut?

Any other ideas?