It's just too much work for a punishment that could be avoided easily with a suicide, not to mention the 30 seconds you get to start the round has to be worked around as well.
Instead, I'd go for something like a "Hurry the f**k up and blast the innocents" message to the Traitors. It seems that they cannot notice the amount time left.
I see a lot of traitors in rooftops where people just walk around and do nothing. Too many people are delaying rounds and should learn their lesson
We had a traitors who camped the far corner of rooftops a few times. They would protect their ground (or so it seems) and make short rounds go three times longer than they should. He definitely has good reason for this.