One Piece Barstem for 1 1/8" D shaped steerer (Factor Ostro)

[MysticRiver]

I'm building a Factor Ostro, but have been unable to find a 400x110 black inc integrated barstem. Does anyone know of other handlebars that would fit the factor? I've found a few non-integrated barstems that should work (hole in the back of the handlebar to route cables into the stem), but wondering what my options are for integrated sets.

Any suggestions much appreciated