That wouldn't work like you're hoping. You're assuming a (representative) respondent pool that's all of these: 1. capable of switching off preference falsifica

That wouldn't work like you're hoping. You're assuming a (representative) respondent pool that's all of these: 1. capable of switching off preference falsification for a survey 2. introspectively active (and accurately so) over a long enough period to notice that they behave differentially in public and private contexts 3. interested in exposing this degree of candor for a survey, i.e. motivated to "show the researchers" (show themselves, really) their belly after collapsing across all the reasons they'd rather not. Humans are primitive. Questionnaires have to be designed around that.