Same questions as Mike! Looking for better ways than I have been using....
I have been using a small touch-up gun for KK paint. I generally try to cover in one coat, which is quite do-able with KK when thinned just right--except for yellow. The base has to be uniform, too, not just for yellow.
Otherwise, it is a "clean everything all the way" drill. I have had issues with not getting the gun entirely clean and making future jobs waaaaay more frustrating unless each time paint goes thru it, it is cleaned immediately.