This makes me think of two kinds of moderates. It is not literally about conformity but we can find a good criterion for conformity/independent thinking in there: Looking at their opinion spectrum and seeing if they are too smooth and/or short tailed to come from mostly one person.
I'd guess you can try to find accidental members for most groups.
- Look at their spectrum of ideas. They should scatter differently around the group ideal.
- They probably have opinions about other things than socially enforced, might not really have them where enforced.
- The set of groups they belong to probably seems less transparently coherent than for more conform people.
- They make 'stupid mistakes' by civilisational standards because they reject some of the long found solutions to sometimes find something new and often find something that does not work or just looks quirky.
If you yourself are an accidental member of a group with a strong identity you might feel much less belonging than others. You might even be surprised to be counted as a member as others see the (accidental) fit and it means little to you.
More markers for self observing conformity would be quite useful.