Long story short, Anders jumped into Exsilium ranting about mages like he does, & has subsequently made a couple of stabs at mage community-building that his horrible mun never follows up on. His magebro/roomie Martin has now picked up the project by spamming all mages. ;)

So, the Initiative hasn't tried to force the mages into any kind of group (which is good because Anders and maybe also Fiona would flip out due to canon issues) but the transports are kind of sort of making a mage group of their own.