Finally, on your "hold your nose and vote for Clinton".
In her last primary, I did not support Dianne Feinstein. But when her challenger lost, and November came around, I held my nose and voted for her. I'm certainly not going to vote GOP, third party, or write in on election day. But having done it before, I can not effectively convey how bone deep unpleasant the act was, and still feels to this day.
But many people do it, and you have the risk of your "babby naive" Sanders supporters waking away from the November vote if he isn't the nominee. So the flip to your case is that if Clinton isn't the nominee, you hold onto that Sanders support, and her supporters hold their nose vote blue again like they ultimately did with Obama. You get a better base going into the general. So, wanna keep pushing that one?