Couldn't you just use a regular $2 laser pointer clamped into a big Romex connector? Drill the first hole a little smaller than the thread of the connector. Screw the connector with the laser in the hole and drill the rest.
I am sure you could dig around in your connector and adapters to refine this idea, maybe use a RMC to RMC connector for a bushing in the first hole to make it more stable.
