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https://www.alpkit.com/products/exo-rail-seat-pack-mounting-system
Is this not what youre after? And strap whatever to the top/bottom of it. Dont see why youd need alpkit specific bags for it
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I was thinking something like this with a loop that drops down parallel to the seat post would be ace. Then the seat post straps could be fixed to it off the seat post and the dropper can freely operate.
Alternatively the same design but mounted at the base with two clamps on the seat tube to keep the bag stationary while the saddle drops?
Yeah that's a bit much... Might get a length of 7mm stainless tube and try bending it into a seat tube mounted saddle bag rack? Just need to figure out a good way to clamp it to the seat tube.