Mnemonica has the color separation in it. I found it in there the other day. The stack makes the deck looked mixed but I do understand what you are saying. Juan Tamariz does have a little section in the book that will make the deck look mixed... plus antifaros can also make the deck look mixed very well.
So if you wanted to perform tricks with a actual mixed deck and then have it end in original order the only thing I can think of is to get the deck into the stack from a mixed pack which is explained but I have no read that part yet so I don't know how practical it is, But Tamariz explains that he does it. Once that is done the stack can be put into new deck order... two different ways, Either like a rummy demonstration that is easy and shows the cards will mixed at first, Or there is the normal way. These are very easy once the deck is in the stack, so you really don't have to learn a whole stack if that was not your interest!
I have had the same thoughts you did but found some tricks in the stack I couldn't pass up so I decided to work on it! I will keep my eye out if I find any other ways of doing it, that doesn't involve a deck switch, Which is in the book too lol.
-William McKeehan