Not sure I understand your point here Colin. I've spent many years in jazz combos playing the gigs that you outline in your posts. Of course, the more you study functional harmony the less you will be caught out. In fact, the old adage that if you can play the blues and Rhythm Changes you won't go far wrong is a good one. Add to this a dozen or so 'peculiarities' and learn them in 12 keys and you're there. Until you want to superimpose changes and then then whole process of learning is enhanced once more.Sometimes 32 bars is all the time you get.