It could be of interest to mention that Heisenberg proposed to
distinguish practically three kinds of electron. This may lead to
three kinds of "electrical charge"? (On the other hand, some
physicists describe Hartree-Fock potentials on the *active
electron-passive electron* interaction.) According to Bridgeman,
different operational measurement procedures may lead to different
operational definitions. So, we may have many more kinds of electrical
charge, by definitions.
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I would go a little further - My gut is telling me that if you queried
the majority of physics faculty about a "one-component model" of
electric charge, they would respond that they have no idea what you are
talking about. I can't in my wildest imagination believe that students
entering my General Physics class have ever heard of such a concept.
They all "know" that there are two types of charges: negative electrons
and positive protons. A scarce few might mention positive and negative
quarks with fractional charges.
I think we are in one of those classic situations on the list where
everyone is saying the same thing but talking past each other.