My reasoning is that if, when you kick off the drift, you have not got enough rudder to straighten up
I'm pretty sure that there's a certification requirement that the aircraft has to be capable of landing normally with a crosswind component that's x times the stall speed. (x=0.5 or thereabouts?) So you should have sufficient rudder and aileron authority to obtain the required wing down/sideslip attitude, and sufficient ground clearance in that attitude all the way down to the recommended touchdown speed, at the stated *demonstrated* crosswind limit.
Of course if you exceed the limits of the POH, you're a test pilot and all bets are off.