Hey, you can't have the luffy crew without at least the ram's head.
But yeah, if they're calling GM a crew member now, then yeah, this would be an easy solution. What would be even cooler would be if they had the shiprights build a new ship and integrate as much of GM into it as they could, then GM would live on in a new form, Ussop would be happy, Luffy would be happy, and Oda's prophesy would be fulfilled.