Will I kill the value of my Demon

It's your car. But a color change on a Mopar is a big deal - like you might as well restore it big. Jambs, engine bay, trunk... It all has to come apart for it or it looks like carp and a quickie deal. Ultimately when you sell it, the buyer will use it against you. If you want a real Hi Impact color - and you have interest in selling it down the road - find one and buy it. Otherwise either do it half *** and lose a bunch of value, or spend a boatload, do it right, and never get that back when you sell it.