There isn’t one, as you say it’s over 2000km between them, the only link is that when Britain was administrating them it did so as a single territory. This is not some reunification of a country separated by a colonial power.
The whole thing stands as a monument to the decline of the British Empire.
Randall got it wrong in What If (https://what-if.xkcd.com/48/). The sun's going to set on it because of the Indian Ocean territory going.