If you don't like true seeing, you could always use the whole "the first time you see an illusion, you may make a save to disbelieve as though you had interacted with it." That's a little more in line with a super-low-tier artifact.

The thought of an embedded sidearm that's perfectly hidden comes to mind. You're always proficient with it, but it's got no enhancement bonus, so it'll never be your first choice. Does boosted damage against poorly-armored foes. Perfect for both self-defense and assassination. Would be located in an inconspicuous place, normally either the thigh, behind the hip, or above a shoulder blade.

Also, typo. Legplates refers to a damage bonus when context dictates that it refers to a Jump bonus.

On the whole, actually glad to see someone monkeying around with Warforged Components. I think they're cool, and your cloak idea actually sounds more interesting than the stuff you already have. Capes are normally meant to be impressive, so maybe you could merge some of those necklace ideas in, like the bonus to Diplomacy and Intimidate, or the anti-silence? Cloaks are floaty and free-flowing as well, so maybe it gives bonuses to Escape Artist checks? Regardless, it should probably grant scaling resistance bonuses as well, so as to not appear like it's competing with the Cloak of Resistance. (Would you be able to wear a normal cloak over a component cloak?) Even if you aim low and only do a couple of the fluffy bits, it'll still be really cool.