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It is not clear why you need a pinned node to have master and slave node designations. A pinned node should have the appropriate rotational degrees of freedom released and the translational degrees of freedom fixed. It may be that you are having trouble distinguishing between a constraint (which does require master and slave node designations) and a restraint (a support node). Or, I may be missing something myself.
If I understand correctly, you wish to apply an axial load eccentric with respect to the column centroid. I suppose you could use a very rigid element (large Young's modulus, area, and moment of inertia) with length equal to the desired eccentricity. This would eliminate the need for constraints. Or, this very short element could be a link-type with large specified stiffness for all degrees of freedom.