OoC:
In general, I do not think that the able assistance rules are in need of serious revision. Is it not sufficiently clear in Chapter 2 of the Regent Guide that there are five types of able assistant, which fit into three categories?: advisors and hirelings; followers and cohorts/henchmen; and lieutenants.
Perhaps the Hire Help "loophole" might even be left alone, letting regents wonder what might be the consequences of swiftly promoting new advisors to henchman (or lieutenant) status.
Also, here is a question, which might be considered: other factors (character level, administration skill, etc.) being equal, why should henchmen be more efficient administrators than hirelings? (In the current rules, they are equally capable of performing administration . . . which might be preferable, no?)