G'day mates, Just here to bring out the full idea for my suggestion on Thranx being able to take over the Changling Hives to reunite them to then allow for a Changling Lands Reichspakt State, lead by Thranx or maybe Svrivax (I forgot the lead field marshal's name for the mission to Griffonia from the Hives).

ROUTE A - THE CHANGLING CIVIL WAR
Prerequisites:

> Changling Hives fall into civil war via the Thoraxian Betrayal Focus
The Civil War with the hives would probably cause the mission in Griffonia with pressure to return to the Queen's side. The Griffonian Empire, who currently holds the 2 General's, are told to basically hand over the generals to help with the Changling Civil war for the Queen. Griffonia can do the following things:
1 - Comply and send them to the Queen
If you choose 1, the Changings will return the mission if they win the civil war, or if they loose, Thranx and some other generals, maybe Trimmel, may join the Griffonian Empire as a Military Colab government set up as a new queens government in exile. If Griffonia annex's all Changling lands they can establish a Changling government under Trimmel or Thranx.
2 - Take advantage of the situation and keep the Generals
If you select 2, you will have Svrivax return to the Queen anyway, like what happens when you select the 2nd option for the recalling of the mission for Alicorn Sunset. Thranx will stay however and the same thing happens with the 2nd option for the recall of the Mission. You can also steal the technology for the Panzergrenadiers and use them as a re branded "Kaisergrenadier's".
3 - Establish the Third Party
If you choose 3, you will get 2 events:
The Secret Meeting
You basically tell Thranx and Svrivax that you want them to establish a new Changling hive state under the Reichspakt, and while this does sound very hard for the state of the empire you are in right now, you could still try to pull this off. You gain decisions to aid the 3rd party in their revolt against the Queen and Thoranx. Once preparation is complete the revolt will commence.
The "Promise"
You essentially say that you will return the mission sent generals (Lie of course)
(If you want more for this and its outcome's I will proved them at the end. Same goes for option 2.)

ROUTE B - THE SECCOND GREAT WAR AND LIBERATION
Prerequisites:

>Changlings have taken Nova Griffonia as a faction member or as a protectorate.
>Griffonian Empire has conquered all Northern Territories, and also has defeated Aqueilla
>The Archon is currently in Charge, or Grover the Sixth
>Thranx survives

After the establishment of Pax Chrystalis, you unlock a new mini tree linked to Northern Expansion:
"To Defeat the New Giant of Eques"
In this tree you basically get 3 stages:

1 - The Preparation
4-5+ Focus's (Idk maybe more)
Basically, you build up a navy and army, plus air force, to be able to defeat the Queen's Reich. You also prepare for a new government to set up in Equestria, Olenia, Yakyakistan, The Northern Protectorate, the Crystal Empire, and the Hives. You assign ether military governments, civilian puppet states, or you liberate the state. It is recommended in my eyes to liberate Equestria and the Crystal Empire as the liberation of those states makes them easier to earn them in a transcontinental united alliance idea. For the Changlings, you can assign Thranx, Trimmel (?), Thoranx (if he accepts to join Reichspakt) and Svrivax.

2 - Invasion
3-5+ Focus's
You begin the invasion and also stage a uprising in coordination with the Equestrian Resistance, creating a continental rebellion coalition backed by Continental Griffonia, which is just the Empire. Focus's are there to aid war stuff and to also buff coastal defences and deploy militias encase stuff goes horrible for you.

3 - the Changling, and maybe more, colab governments
20+ Focus's (?)
Prop up, rebuild, and reform. You also get a branch for suppressing Equestrian Resistance Forces if you occupy Equestria and Crystal Empire as puppet states.
Also maybe a path for the Transcontinental Alliance if Equestria and the Crystal Empire are free and not puppeteer-ed. You also get to choose the Transcontinental Alliance Parliament's location. Their in Griffenheilm, Canterlot, Vespolialis, Crystal City or Aquilla.

ROUTE C - THRANX'S COUP-DE-TAT
Prerequisites:
>Either Pax Chrystalis is established, Thoranx Civil War fails, or Alicorn Sunset is being prepared for
>Thranx has survived assassination attempt

This is basically like the first route, but you mash it with the third route. I am kinda bored as of getting to this point and will add more to this later, so cya mates.