OOC: As a demon in a dwarf's body, who should I talk to first if I intend to announce that fact to everyone?
Well, count out everyone who would instantly kill you. So no Brenzen, Rhaken or probably Artyom. They really can't know.
Lokast wouldn't tell anybody (he's mute BTW), most of the others would just be weirded out about it. Basically anyone who takes you seriously about this should be avoided.
A good angle might be to feign madness? That way the demon can act with impunity & the Knights won't do anything. Then you can interact with people who take it seriously but aren't murderous, like Fractal perhaps, and everyone else who's willing to go along with it in lieu of a argument.
In case anybody's interested as to where I get my ideas about the militia in Demongate, I've been running a parallel fort with a similar military focus (absolutely no traps, as a matter of fact). The RNG called it Greateststandards. Allow me to continue to talk about it whether or not anyone is actually interested, because I played it a lot today (it's just starting its 8th year now) and it's still on my mind. This is vanilla btw, so no Bloodkin spoilers.
It's got a surface palisade like Demongate. Turns out I was wrong about the archery towers btw - while dwarves do need room to dodge enemy fire, they should be forced to keep close to the fortifications. A row of statues between their position, the fortification and the stairs forces them to move right back into firing position after a dodge. I'm currently expanding my towers so that they're actually just a line of fortifications/statues/ramps around the palisade so I can order my dwarves to patrol the walls and move into the best positions regardless of where the enemy spawn.
Avoiding cross-training by keeping militia segregated is a great call. I've currently got a militia of 46 (in sword, axe, spear, hammer, and 2x crossbow squads respectively, although I'm going to make a new Mace squad soon) segregated in this manner, and believe you me it helps boost weapon skills quickly. I've tried to seed talented wrestlers around to try to boost wrestling stats in individual squads, but this has not yet succeeded.
Quality does matter a ton. I got in a war with the humans and elves in addition to goblins early on. I experimentally charged a squad of crossbowmen with my militia to see how they held up. 8 severed spines later, I reverted. Later I charged larger swarms of bowmen mixed with infantry, and received a whooping no projectile wounds due to better armor quality.
Actually, this fort is kind of embarassing. It has no dedicated workshop space after 7 years of gameplay, the framerate is atrocious, and I've been known to revert saves rather than accept extreme losses. I also haven't really been able to maximize militia happiness, which would really help accelerate training. You can fix most of the duty happiness bugs (making time off actually reduce the amount of time the dwarf has been 'on patrol' so they don't just get progressively more sad over the course of the year to the point of having to take them off duty for basically a year) with DFhack, but since we probably won't here I didn't there. And, despite having a volcano that against the odds is 2 z-levels below the surface, I haven't built a magma cannon. But it does have a solid gold pyramid tomb (4 z-levels high) for my militia commander. So there's that.