Ooh! Another way to absolutely make sure that they're good and stranded: put them on another planet!
Maybe they're stuck on a habitable but lonely world thanks to the New Kryptonians, Tempus, Mxyzptlk, or somebody else. Maybe it's completely earth-like, or maybe it's so alien that they have to figure out what is food. Since Clark can't go into deep space very long without assistance, you can have them stuck without needing to mess with his powers in any way (although you still could, if you wanted to).
