" Surely you don't think it's a good Idea to have a king air 200 captain with 1000hrs? "
That would all depend on the pilot and his/her training and type of flying they did during that 1000 hours.
If any pilot can not learn to fly a KA 200 or any other airplane of that type in a thousand hours they are in the wrong business.
As far as ag work goes it takes far more airplane handling skills than flying a small turbine IFR being led by the hand by ATC most of the time, or watching the thing fly its self on auto pilot.
And it does not take 1000 hours TT to fly ag work.
It is really interesting the different ideas we have about flying, sometimes I wonder how it became so difficult over the past several decades.