The Title says most of the general idea, a place in waste outposts to get a good height to fly elytra from, the less dirt pillars, the better
The only problem I see is that its never certain where the outpost will appear. If its in an ocean or a little above ground then you already have a good height I'd say. I mean; if you're not careful then its easily possible to suicide while jumping off an outpost (a random one). Surely that should be enough to get you going on an elytra?
First of all, I think that is the shortest post I have ever seen you write. Joking aside, I don't think I see the issue here. I don't know much about the Elytra (I have never used one), it seems that it works better the higher up you jump off? So the extra height will allow you to fly a farther distance. Also, I like the idea of making platforms every certain number of blocks (15? 20?) so that players have more control over how high they jump and how far they go.