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I'm going to try and bodge something out of an old crud catcher rear mudguard. In my mind, its going to to be secured to the post below the bag. Flipped upside down so it angles up and aligned to the angle of the seat pack. May put a couple of slots into the plastic guard to enable strap to threaded through. Will provide anti sway, linear support and some extra splash/stone proofing.
Pics will follow whenever i get round to it/finally get out for an adventure.
There's this thing
https://www.youtube.com/watch?v=PPR2u-qZhIk
Which one could easily bodge out of something like this
https://www.ebay.co.uk/itm/Bicycle-Cycling-Seat-Post-Back-Double-Water-Bottle-Holder-Cage-Rack-Adapter-GD/263252515042?_trkparms=aid%3D111001%26algo%3DREC.SEED%26ao%3D1%26asc%3D51001%26meid%3Db334ac48a6b34a4b9270528c75971a91%26pid%3D100675%26rk%3D1%26rkt%3D15%26sd%3D263252515042%26itm%3D263252515042&_trksid=p2481888.c100675.m4236&_trkparms=pageci%3A035ac7b7-4175-11e8-9da9-74dbd1803149%7Cparentrq%3Ace837a2d1620ab6ad32f0bc9fff7ce56%7Ciid%3A1
It would work with a dropper, you would just need something top stop the action to protect the bag. Something like this
https://www.wolftoothcomponents.com/collections/small-components/products/valais-25
Which im sure you could easily make out of something designed to clamp onto the post.