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Back in the 80's, RCA came out with their first stereo TV set, the CTC131. The stereo sound decode was on a separate set of boards, and all you needed to feed it was some of the TV set IF tapped off the tuner output. A CATV splitter would work fine for that. One feeds the stereo decoder, the other the normal TV IF strip.
Another possibility is to raid an otherwise dead stereo VCR for its stereo decoder circuit. Again, split off the TV sets tuner to feed the VCR IF. Usually an RCA jack inside. Or just remove the tuner module and feed the IF trace from the TV tuner.
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