So this could work but ideally need a quick release clamp as MrsHobs and I frequently swap between saddle heights
EDIT: Quick Google shows these exist, thanks! https://www.activcycles.co.uk/components/saddles-seat-posts/bontrager-seatpost-clamp__3439?currency=GBP&chosenAttribute=415187
A brand X dropper post is the best investment for a shared bike
If they're hard to get a hold of you can also use a bracket on the mudguard hole, its what LvH recommend and is a bit tidier than the seatpost clamp option.
@pjhobs started
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So this could work but ideally need a quick release clamp as MrsHobs and I frequently swap between saddle heights
EDIT: Quick Google shows these exist, thanks! https://www.activcycles.co.uk/components/saddles-seat-posts/bontrager-seatpost-clamp__3439?currency=GBP&chosenAttribute=415187