We're definitely open to any ideas anyone has for these kinds of missions. We have a few ourselves, but the Katana Fleet ones are the only ones we really have fleshed out to any large degree. I intend to open a topic for those suggestions, but we do have a few basic criteria for them.
I'm not saying yours don't fit them (the Knight Hammer one is certainly something I'll look into, because it would fit them perfectly from what little I know about it), I'm just explaining them for anyone else who wants
1. They have to fit within the context of the GC, without being something that necessarily dictates the player's actions. This basically means we can't "force" any major battles to happen, such as the Battle of Bilbringi. The Battle of Bilbringi is only important because of it's results, being the death of Thrawn, which is rendered moot by the player deciding to hold the Battle of Bilbringi at, say Ord Trasi. The difference between this and the Katana Fleet is that the Katana fleet was where it was independent of any action the player could take, and Karrde would be necessary to find them (with the suitable alternative situation for the Remnant)
2. They have to have a suitable reward that makes them worth doing, without meaning you lose the GC if you don't. The Katana Fleet has obvious advantages, even if it's to prevent the other side from getting it (and if you don't act within a certain amount of time, they will). For example, ending the Caamas Crisis doesn't really have gameplay implications, and getting BACs as a reward for invading Nirauan with Luke and Mara may be a bit too tenuous and require too much explanation in game.