I've seen switches with S-Video, Coax, and RCA inputs to RCA out before... you could connect that to a RCA to BNC adaptor....
but you'll lose the added resolution of S-Video like that....
I think you will be hard pressed to find exactly what you are looking for in one piece.... but regaurdless radioshack is not the place to do it unless you have a bunch of spare money.... find a good electronics shop that sales to professional installers... they will have a better in-store selection and MUCH MUCH better prices....
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Whoever appeals to the law against his fellow man is either a fool or a coward.
Whoever cannot take care of himself without that law is both.
For a wounded man shall say to his assailant, "If I live I will kill you, if I die you are forgiven".
Such is the Rule of Honor.
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