The dragon egg has no usage thus far. I suggest a method to link two transit portals in the outer end. Usually they would teleport to the main island. By linking them, they teleport to each other like the portals that are generated after the dragons death on the main island. By doing that you can link two settlements in the End together.
As the dragon egg is a unique item (there is max. one at all times and the game should keep track of that), it can be used to mark a transit portal in the end by placing it on top of its uppermost bedrock block. I suggest that you can place a beacon underneath another unlinked transit portal (unlinked = just teleports back to main island), and if you activate that beacon with an ender eye it would emits colored beam and teleport the dragon egg on top of that portal to show success.
After that a two-way travel between those two portals is possible and they no longer teleport to the main island.
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