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I was thinking SRAM Doubletap would work - you drop the post on the first click (outer ring) then shift it back through to the the start (lower ring).
There are 27.2mm posts about... cable routing would be difficult though, I agree.
Not going to do it (I'd want a dropper for my MTB before I start messing around with one for road), just curious
frankenbike
there are examples of this already using sram groupsets
main issue is going to be finding a dropper seatpost that fits the frame, and a frame that has the cable routing for the seatpost