I don't think Vasquez would be the starting SF in this case, I think it'd just be a place to get him more minutes so he could be your back up PG but still get enough minutes to keep him happy as a 6th or 7th man. As long as there isn't a stud SF you could let Vasquez guard the 3rd worst perimeter player assuming your PG upgrade is good on defense. It's not much different than the SF minutes Roger Mason Jr. gets.
It's very different. Mason doesn't need the ball in his hands 48 minutes a game, he atleast can be a decent spot up shooter. Vasquez has absolutely no idea what to do when he doesn't have the ball. Go back and watch his movement (or lack thereof) on any possession that has Gordon taking the ball up.
Vasquez' best qualities are his court vision and passing. Playing him at the 3 at any time would make him nearly worthless other than the fact it would give us 5 warm bodies on the floor.
Like I said, if it gets to the point where we can't pull anybody that can play the 3 off the bench over Vasquez, we need to clean house.