First, I have NO belief that the people who attended such a Convention would do as instructed, nor limit themselves the the 17th.
Do you not see that with the current group of leaders (and voters), federal and state, that changes in Constitution will simply be ignored? Don’t they ignore Art 1 Sec 8 now? And, we can’t even get our side to show up for special elections!!
I repeat read the Levin book there are solutions to all your questions and NO there cannot be a run away convention. The power is to be returned to the STATES, the swamp will be drained.