You should not look at a single keyword. Having any three keywords active is enough to activate an Excellency, so just having a bit of overlap in Excellencies you have isn't necessarily a bad thing. One thing the third option has that stands out is "defies all odds" which is very not-Ebon Dragon, because rising above is not really something the Ebon Dragon does or understands. All Excellencies could be used to defy the odds in that they warp probability in the user's favor, but in this case it's practically a free keyword in any desperate situation.
There is nothing in the third option that requires you to be a horrible monster to use it, or at least not any more of a horrible monster than being a rather alien, monstrous, strange being you will become simply by taking Infernal charms. You said it yourself, it's not about WHAT you can do, but HOW you do it.
You want to stop an evil tyrant? Use Oramus Charms to drive him mad, give him severe depression as a derangement, and things like that until he either self destructs or his own followers decide to kill him. Are there cleaner, more straightforward ways to solve the problem? Sure, but they're not necessarily in your toolbox, so use what you've got. Or maybe you've come across a starving village, and the only way you can save them is using Locus Mana Plague. Sure, you're kind of mind-raping them to revere you and follow the Laws of Cecelyne, but they'll live when they otherwise would have died, and there's nothing stopping you from being a benevolent ruler who cares for his people. Hell, you can use the same Charm tree to summon a crapload of mutant demons for your military so your people can live peacefully instead of having to conscript them like some Solar asshole who uses his Essence fueled words to mind-rape a bunch of farmers off their land to join his army when they otherwise wouldn't.
It's already in the third one.
"The Sevenfold Peacock is an artist without parallel, expressing his inspiration in eye-watering images and tales that drive men mad."
There is nothing that says we are limited to being a general. As an Exalted we are capable of being many things. We don't want to spread too thin, but adding 'artist' to our repertoire wouldn't be a bad thing - lots of Oramus's Charms use art. At Essence 4 Soul-Eroding Production can be used to use Words that Twist Like Daggers against someone at range if they are viewing an original piece of art created by the Infernal, and at Essence 5 it lets you teleport to it. Art can also be used for regular social attacks, and being an artist without parallel could make them very effective.
We could for instance use our various Charms to create an artist persona, invite a number of Britannian nobles to a viewing of our artwork, and then do all sorts of things with that opportunity. Drive them mad with the appropriate Charms, use Locust Mana Plague (either with an ally or by ourself if we have the Charm) to make o'dourves to get them on our side, use the themes of our peerless artwork as social attacks to change their views of the world, or just use the entire thing as a trap to kill them all once they're gathered in one place.
We can also use the artistic aspect of our Excellency and the relevant Charms to enhance the art of others. If we got Clovis on our side we could use them to enhance his artistic skills to use for our purposes. Or whoever creates our custom, unique Knightmares can have their efforts enhanced by making them not only weapons of war but glorious, unique works of art.
