I looked through the BRINK cvar list and couldn't find any commands that modify the HUD. Does anyone know of any?

I want to remove blood, muzzle flash, player names, objective names, anything that gets in the way of gun fights.

If you want to reduce muzzle flash then get a muzzle break or silencer, and blood splatter is also there purposefully to inhibit your gun-fighting capabilities having been shot 27 times with a minigun.