I appreciate your strict use of "pop"as an adjective rather than a noun when characterising parties which, indeed, in practically all cases (the pure populist parties are rare, if at all) are primarily something else and only then populist.

Having said that, all these party categories do have a non-populist counterpart, at least conceptually. It would be useful to find out how these counterparts fare in real life in terms of the voter support compared to the pop siblings.