I think this a good argument for collecting more points that Less Wrongers can use in real life to guage someone's rationality.

Mmmm. Trying to pick out rationality litmus tests seems like the kind of project EY was talking about in "The Correct Contrarian Cluster" and "Undiscriminating Skepticism".

I don't know how feasible this is, ultimately. The closest test I can think of is probably the Cognitive Reflection Test. (Which has the advantage of being a trio of little arithmetic brainteasers rather than anything that'll trigger people's politics detectors.)