Mebbid
Aquarium Advice Addict
I think you have to put off your buyer somehow. Any other solution won't give you time to cycle, and you'll have to cycle twice.
If the rock is already in the tank then its already cycled to the bio mass of the fish in the tank. There won't be any cycle to deal with.
Seriously, just get a big tote and put everything in there. Heater, water, live rock, and live stock. You don't even need a hob filter as long as you have an appropriate powerhead. It's nowhere near as difficult as its being made out to be. There really is no difference between using a tote and a tank aside from not being able to see through the tote. It will last as long as you need it to.