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As long as you have a reasonable plan and feel you can execute it, there is nothing irresponsible about crossbreeding. Unless you have a copy of the SOP and are breeding toward that, I don't feel you are really preserving a breed by only breeding purebreds anyway. Unless you carefully select your breeders each generation, after a very few generations yours will not be any better than many hatchery purebreds and could easily be worse than some hatcheries, as far as looking like the breed is supposed to. It requires knowledge and work to keep a breed looking like it is supposed to.
I mix breeds and really enjoy it. I select my breeders for the traits I want. Since I don't show, I have no need to worry about "show quality" chickens, but can concentrate on the productivity traits I want. You probably have different goals than me, so your answer might be different. I don't sell chicks for instance. You can possibly get a higher price for purebred chicks or maybe sell them easier, even if they are not show quality. But I think you have an ethical responsibility to tell the purchasers that your chicks are not show quality unless they truly are.
The only restriction I'd have on mixing breeds is that you need to know what your goals are and do not have a breed in the mix that would mess up that goal. Silkies for example. They make great pets and great broodies but they are not known for being great egg layers. And their meat is dark. If you are raising chickens for meat, many people may find that dark meat unappetizing. And, if they are possibly for meat, you don't want bantams or some breeds know specifically for egg laying (like leghorns) in the mix. But if your goal is eggs and not meat, Leghorns are great to throw in the mix. If they are to free range, some game breeds may be great to throw in the mix, but if they are to be confined, you may not want games in the mix. Bantams lay smaller eggs, so you might not want bantams in the mix if larger eggs is your goal. But if the egg size does not bother you and they are not for meat, bantams may be great.
If you know the breeds and colors of your chickens, some of us can tell you what the first generation crosses between purebreeds will look like. We need to know which is the rooster and which is the hen, but the appearance of first generation crosses of purebred chickens are usually pretty easy to predict. There will be a few minor variations, but the basic colors and patterns are pretty easy.
When you cross the crosses, though, you loose the ability to predict what all the offspring will look like. It depends on what the grandparent breeds and colors are, of course, but often you can get some pretty unexpected colors and patterns. To me, that is part of the fun of crossing crosses. You cannot even tell by the chick's down colors what the adult chicken will look like.
I know I've made it sound a lot more complicated than it really is. If you cross breeds that meet your goals, then you will not have a problem. The problem might come in if you have different goals for different chickens in the same breeding flock.
Have fun with it and good luck!!!!
