Mr. 152,
You should definately go fly the 210. You should definately not expect to be checked out, compotent, or sent solo, after an hour's flying in it.
This will be one of those opportunities you will have as a newer pilot, to demonstrate your serious attitude toward professional piloting, by not trying to convince yourself, or the instructor, that you don't need some mentoring.
Allow yourself 5 hours, perhaps you'll do it in less. Will the insurer cover you as PIC in less?