I totally get the RP appeal of reclaiming Caiyun...
But... really? Really? A new realm?
Realistically, the only way that's going to happen, with the current mechanics, is with a realm out of Donghaiwei... and since I'm assuming you aren't going to give the region to HD...
Your best case scenario is that you crush HD, and place your own realm there... In other words, you kill a tiny miserable realm, in order to place your own tiny miserable realm. Meanwhile, Astrum loses so many nobles, that you fall under your density cap... so you... give Eidulb AND Libidizedd to Westgard...?
It's all so... ridiculous... Dwi needs less realms, not more.