AHHHHH! I see! I would strongly endorse such an approach.
The key would be setting the terms of ratification. And if a state didn't like the agreed terms of ratification, they could walk out of the convention and be done with it. They would need foreign support in case of trouble. They'd have to go to Russia or China or someplace and form an alliance as protection against aggression from the new US system.
The founders who forged our revolution against Britain, and then forged the revolution of consolidation (The Constitution) were THE players in America. The rich, the powerful, the famous. Middle class people like us won't make such a change occur. We don't know the right people. We're too busy making a living. It's really just a fantasy. But personally, I'd love to get out from under the Constitution and have an opportunity to make something better.