If your freewheel spins forward you use either the nylon zip ties or the mechanics wire That you brought with you and tie the big cog to the spokes in three places and just ride home fixed.
Will this work, or is it inside Tech Humor? Sorry, I don't know enough (yet) to tell the difference. I'm much better with stuff that has wires sticking out of it
BTW- thanks for all the ideas. I appreciate you taking the time to share things that are probably obvious to you, but I never thought of.