I was reading on the autosexing breeds from this:
http://www.blue-eggs.co.uk/#/legbar-history/4554275782
I think that your crosses of barred and campines would give basically the same chickens (genetically) except if you didn't use the golden gene male with the silver gene female you wouldn't get autosexing. If you want performance -- say egg laying from the two breeds it probably wouldn't matter, but if you want autosexing, then it would have to be done in a particular way. Hope it makes sense. :O) Or I should say, hope you can make sense of what I am trying to say.