couple' years, eh?
Gawd, what a rad idea, send some folks into a more than hostile environment with limited supplies and tell them to happily enjoy self-reliance while you promise to get everything sorted till the next launch window comes along. I mean, it is not as if you would hand them a bag of seeds, spade, ax and hoe and tell them to get along once they reach the other shore.
"Have you, applicant, been diagnosed as at least latently suicidal or do you suffer from an acute death-wish?"
"Yes."
"Would you, applicant, be happy to die from decompression, undamped impact, fire, radiation or starvation, all on a mission classified as one-way by design?"
"Sure thing, bring the pain!"
"Welcome aboard, Spaceman."
OTOH it would be quite a waste not to use the remaining orbiters as a basis for some bigger space-built craft. I'd imagine you would have to add a massive amount of cargo space just to bring sufficient water & food, not even to speak of equipment and fuel. The whole thing would be much too big to land, so the more rational approach would be to have detachable cargo-bays that can survive going down to the surface on their own and use a landing module for the crew while the main craft stays in orbit. That's if you want your crew back alive. If you man the whole thing with people you want to get rid of, well, you can use the old orbiters, pack them to the brim with those to be expended and tie the bays shut with shoestring. Tell them they are going to deflect a killer-meteor or something. But that is *not* a nice thing to do.