For what it's worth, according to Michael Stackpole's novel Lost Destiny, book three of the Blood of Kerensky Trilogy, in 3052, Kai Allard-Liao was trained in the use of Clan battle armor by Elementals of Clan Jade Falcon when the former combatants united against ComStar forces on Alyina during Operation Scorpion. So at least some Clan members are willing to train even non Clan members in the use of battle armor. Under certain heightened circumstances, anyway.