I am gonna be the odd ball here (big surprise) and say go for it. The speedster is no more of a handful than many other GA aircraft out there that got a bad rap. Gear set up was a huge issue on the pacer getting a bad name as a handful on the ground. Wide gear took care of that problem, just as wide gear on the KF makes it a much more forgiving airplane.

Getting the CFI up to speed on the aircraft will be the biggest thing, and that is due to the nature of the engine etc. If there is a competent tail wheel instructor in your area, and they cant get comfortable in a speedster by the end of the first flight and a few landings, then you need to boot the low time kid out of the cockpit and go find a crusty old guy that has more time in a tail dragger than the afore mentioned kid has breathing.

There are no huge "gotchas" in flying the KF, other than quirky start-up procedures on a 912, or, in the case of a 2 stroke, knowing how to jet and run the 2 stroke. The plane itself is not anything that a CFI should have any trouble with.

Just my .02, and ya get what ya pay for on the internet