There is another group that hasnt been considered yet.
The Blood Dragons.
As I understand it, they weakened after the first Nomad War to the point where they were no longer of much use to anyone - let alone the Order. Allying with the Corsairs and Hogosha would have further strained relations.
That being said, the Dragons have maintained their own separate Nomad Research Facility based out of Sendai (Lord Hakkera himself is rumoured to still be heading this operation). There are also infocards stating that the Dragons and Order still share their research findings.
So what of these 'rebels' then? Perhaps instead of openly fighting the Order, they could seek to restore the old alliance?
On the one hand, it would give these Order Agents (or ex-agents depending on how these 'rebels' are received) a new base of operations and a buffer against the Core.
On the other hand, it would surely rankle the Corsairs and Hogosha - both Dragon enemies.