Incursion: a possible solution for the Augmented Capes

[Crevox]

Yes.
But as I stated before, Megaboss NQ crates have roughly the same chance of content being a cape as normal bosses' HQ crates.
When you factor that in, most likely you'll get more chances to get what you want from Grammk's coffers, despite the larger pool, compared to farming specific bosses for a specific type of cape.

Even if this is accurate, it goes from being a 1/5 to get the cape you want to being a 1/22.

Is that really worth it?

You might say like, oh, well you can get any of the other capes too, so you might get one for another job you want, but I literally only care about the SMN cape. The GEO cape might be nice (even though I have one already), but I don't care enough to bother. I only want the SMN cape.