have you already purchased a good thermostat?
if thats not in the package you are already getting, you could get a good thermostat, and use it with an UTH, and use the same thermostat with the final setup.
some heat tape or a heat mat shouldnt be too expensive, and you can use it to make a hot spot in the final setup.
EDIT: and then the temporary setup would be a basic tub setup with a hotspot and a thermostat and hide and water bowl.