I agree that it gets confusing, because EE is a catch-all that covers anything from a Heinz57 that lays a tinted egg to an bird that looks purebred but you know isn't, to an Ameraucana from purebred parents of different varieties, to an Ameraucana/Araucana cross. The problem with crossing the color varieties is they won't breed true to color from that point forward. But they may
look like one variety or another, and may end up being bred or sold as that variety, and someone finds out only after they've hatched eggs from it and have chicks that suddenly start sprouting odd feathers that there were other colors mixed in (and once you get a recessive color gene it takes generations to get rid of - best at that point to cull them all and start over). To further confuse people, I'm told that this is not the case with Araucanas - non-standard colors can be shown and used for breeding (Araucana breeders feel free to chime in on this), so people familiar with that breed may not realize Ameraucanas cannot.
That doesn't mean you can't cross colors for fun to see what you get, you just need to make a special effort to educate buyers that, although they are from purebred stock, for
breeding purposes they are essentially EEs because they will never breed true again. Perhaps you could advertise them as "Non-Standard" Ameraucanas if you want to make the distinction that they are not crossed with another breed.
Good luck with them - they are very pretty birds by any name!