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My method is to pour boiling water into the flask and leave for 10-15 mins before adding the hot drink. Does help it last longer.
Then put the flask in a pannier and tootle off for the day down some lanes and b-roads.
If there's some loose chippings or mud ask yourself if it would be worth getting a gravel bike, then realise it's not worth the hassle of setting up a #BikePacking specific #OutsideIsFree Instagram account and buying the right dangle mugs as it would get in the way of a nice day out.
Perhaps I should unfollow this thread again...
People who think you can put speciality coffee in a thermos for more than about 30 minutes don't deserve the 3rd wave and may as well just make instant.