It's also in 5-10-1 and 5-10-2.
FWIW, I would handle the action in the same manner as you.
I would start a visible count and when I reach what should be the end of the quarter--sound the whistle.
The difference would be that I would then go straight to the R and tell him that the clock didn't start so I counted it out and that he needs to go over to the table, have a brief word about what just happened, and declare the quarter over.