Would be a brilliant move tbh. Give the big man Hibbert more room to operate down low and more room for George on his drives. Granger is like a solid 6'9 or 10 and taller than west anyway, see below:
And pretty stocky for a wing player, i see no reason why he couldn't bang down low with most 4's. With George now as the undisputed #1 option, he could focus his energy and athleticism on defense and rebounding, taking the shot when it's there and improving his offensive efficiency no longer being expected to create. Just have West and Scola come off the bench as the 4 and 5. That will help against Miami's strategy of starting bosh at c and running the out of them.