Oh. Hi Nauta! I levelled with you in a few worm parties!
I've also levelled GEO for more or less that purpose, but I'm probably going to be shoehorned into WHM when I level it. It's pretty powerful, though! I presume the best way to go about this is to try to ask if teams looking for BRDs are willing to take you instead, since, if you have capped skill and a Dunna, you should be able to cap haste, get good damage on targets, and the like with your spells.
As for LSes, I'm just in one small one, and we're more social. Sorry! Have you tried asking around, or checking out the new Linkshell Courier / w/e services?