Dammit! Of course, why didn't I think of that! I must be so stupid!
Tell you what, you go run your mule to KA. You log onto your character and party up with someone. You hop to your mule, and get them to party up with you, they warp to KA, you log and switch over to your main, then of course party up with them again and then Nexus to them! Omg I must be a fucking idiot!
...
Shame this won't work in Jeuno, or Whitegate, or Tavnazia, or Windurst, or San d'oria, or Bastok, or any other place that you may be because last time I checked you can only invite people from the same region, so the only areas it will work in are if you are ALREADY IN:
- Jugner Forest
Batallia Downs
Phanauet Channel
Carpenters' Landing
Monastic Cavern
Eldieme Necropolis
Davoi
So therefore you'd have to physically get yourself to one of these areas to first party up with the mule in the first place.
Derkaderp.