Tealeaf-
Unlike you, I see no point in writing out long technical explanations to people that do not practice. If they do, then they'll take the suggestions and try till they discover it for themselves.
My post is in no way contradictive to yours, but then you some how where able to go back in time and read whatever I must

have had in my head that day.
Now to business, what you described is heavily dependant on uke, and your assuming that if uke lets go you will be able to strike, hmmmm, is this the option the police officer wants? Have you tested this with a resisting non aikido partner? I have.
I see no point on dropping to the knees, if you do a proper ura movement you will effectively have placed uke in such a position where an easy transition to sankyo can be obtained, sankyo of course being used as one the most traditional police control techniques out there. Heck, if your assuming as you mentioned that its a two handed grab then the ura movement from shihonage can just as easily turn into a very nice udekimeosae which in turn can be easily transitioned into the before mentioned sankyo control.
Notice I mentioned a control in the original post and not a throw? Thats for the simple reason that if you do you go down to the ground you now risk having to grapple. As well, sometimes turning a throw into a control gives you a better position to do what was originally intended, which was in this case to cuff someone.
My shihonage works quite nicely thank you and turned into nice osae waza when practiced with that intent.
Perhaps you can make what you described work for you, but don't tell me what i do is rubbish until you've actually practiced or expereineced it.
-bamboo