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You are right, if I get a complete blank class (no methods, no properties) then I won't get the AddProperty method either!!! -- Dough! I didn't think of it before, I guess is time to go to bed :)
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You could grab a small-imprint object, like Line or Relation, and declare all base properties and methods (except AddObject) as Protected or Hidden. This would achieve some of your goal.

Interesting side note: when VFP first came out (the very first release -- 3.0, before 3.0a [or was it 3.0b?]) an "empty" class was exposed that had no exposed methods or properties, and was much smaller memory-wise, than any other class. I believe this was an oversite on the Fox team's part, though -- by the very next patch it was gone. Of course, wise-*ss that I was, I had already used it by then as a basis for a class of custom methods (d'ohhhh!!).