As I just mentioned... it would unfortunately not be.
Either everyones refreshing gets a lot slower.
Or the entire squad system, incoming system would need to be reprogrammed...
Simply put, the incoming list is just a compilation of what you already see in game -- its not currently a separate system, it's just a different display.
Additionally all the squads grouping together and so on are just a graphic and not an actual entity on the server side.
So yeah, non trivial. Doing it ugly would slow down everyones connection, doing it pretty would simply take too much time.
There's too many other things to work on currently, it's worth mentioning Battle Dawn is pretty much a completed (albeit imperfect) game.
There are a lot of opportunities for small improvements and time savers like this, and we could probably spend a few years pursuiting them all, but in the end there are also entire groups quitting because of various reason or not joining to begin with because of others.
I'd rather spend the time on smaller also convenient features and larger features with a bit more impact.
Closing this for now, I'll reopen it if something changes.