Scarlet Kings ARE milksnakes...Lampropeltis triangulum elapsoides. The species triangulum is all milksnakes...
Anyhow...as you read, scarlet kings can be quite picky and difficult to feed, and often don't make the best pets. They are fine if you are experienced enough to monitor their weight and dietary needs, and capable of feeding multiple lizards per week for feeding...otherwise, they can be a right pain in the...neck...
Look into an Arizona Mt. king(Lampropeltis pyromelanan pyromelana) or a knoblochi Mt. king(Lampropeltis pyromelana knoblochi). Both are gorgeous tri-color kingsnakes that have adapted well to captivity. They are easily found as CB babies, and *most* breeders won't sell them until they are willingly eating pinky mice.