Hmmm...
The trouble I see with the Robinson governor is its kind of reactive, rather than pro-active.
I would have thought that a better option would be to change the software (if its not simply analogue) in the R22 governor to implement a proper PID (Proportional, Integral, Deferential) routine, when the rate of RRPM change and positional change of the collective would determine the increased (or decreased) rate of throttle opening, you could monitor the RRPM drop and direction and acceleration of collective travel and pre-empt the throttle to full before the horn sounded... Its a common technique in software, use it here on stuff I make (gritters and snow ploughs) Plus its kind of what I do in the 47.
Mind you if its an analogue governor, which having flown a 44 I suspect it is then its not so simple to do.
Cheers all
Kev.