I have since found that the "can only use Midchart if you advertise it" rule does not apply to top KO brackets or to "Flight A." Apparently the latter is interpreted to include the A/X half of strataflighted games. One wonders exactly how high B has to be for it to apply.
This does pose the problem that, if there is no advertising requirement, you have no way to know what is and isn't allowed. I will make a note to myself to ask on the first day of such tournaments this next year, and see what range of answers I get.
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Siegmund, all I can say is that I played in a "nothing special" sectional in Edmonton a while back, and caught a couple of people speeding with Mid-Chart defences to our 12-14 NT on Stratified Saturday, and did confirm at the time that on Flighted Sunday, were we playing in Flight A, they would be allowed.
...and all I can say is that a) the Edmonton unit, not District 18, would set policy for that tournament, and b) flighted sectional events are mighty rare down here -- I think I have seen one, in the last 20 or 25 sectionals I played.
Glad to hear that Seattle, among other places, is liberalizing. There may be hope for this game yet.