The whole point of Newcomb's problem is that CDT two-boxes and prediction "isn't really you", so that we have a conflict of intuition to one-box and CDT, and need to resolve it somehow, thus gaining new understanding. What is your thought experiment for?
Problems where CDT loses can be (probably mechanically) transformed to "strategy-equivalent" problems where CDT wins. That's at least interesting.
It even suggests a decision theory. Just transform the problem and use the strategy that CDT recommends for this new problem.
This is equivalent to Newcomb's Problem in the sense that any strategy does equally well on both, where by "strategy" I mean a mapping from info to (probability distributions over) actions.
I suspect that any problem with Omega can be transformed into an equivalent problem with amnesia instead of Omega.
Does CDT return the winning answer in such transformed problems?
Discuss.