There really are no geckos that are going to be able to survive and stay healthy in the long term in that kind of setting. The tokays and bibrons would just take longer to die.

I also have loose feeders and I've had geckos (such as my bibrons escape) and they were always worse for ware after their adventures. Loose insects are usually half starved and will not have the advantage of being gutloaded and vitamin powdered. Low humidity and difficulty finding water can also prove fatal by leading to retained sheds, dehydration, etc.