If you're concerned the prop nut might come loose from the reverse rotation, drill and tap a 3mm hole in the prop driver face. Screw in a bolt with a bit of loctite on it and cut it with a cut-off wheel some 5mm from the prop driver face.
Put the prop on in a desired oritentation and tighten the prop nut snug, or just enough to indent the prop. Drill a 3mm hole where the prop is indented - 5mm deep or maybe a bit more.
Now you have a nice index pin that prevents the prop to come loose from the reverse rotation.

I have one of Antique's G62 Lite mounted in a 133" Cessna 421 that is set up like this