Let’s forget about the legalities for a second (just because something isn’t prohibited doesn’t mean it’s a good idea).
As someone who presumably does business in the area, do you think that this will be good for your future business prospects? If you think that people will hear of this and think, “I definitely want that guy to do work for me”, then great.
But if you think people might think “Wait, wasn’t that the guy who stood protesting outside of that restaurant when he didn’t get paid??? Nah, I’ll give him a miss, i’d be too worried our relationship broke down and he tried to drive our customers away too”, then you may wish to exhaust other means for recovery first.
No one will know the full story, so people may think that the restaurant didn’t pay you as a result of a dispute, shoddy workmanship etc, then you went mental. In fact, if I was the restaurant, if you did that to my customers, I’d be considering telling people that I didn’t pay as a result of you being rubbish and mad as a hatter 🙂 Care needed IMO