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Can't find a reference right now, but there was a set (Japanese, I think) like your description that allowed watching three stations and switching either of the smaller pictures onto the large one.
The Japanese manufacturers were fond of actually producing these sorts of "gee wiz" things and might even sell a few; they had engineers to burn with their policy of lifetime employment, so they could be put to work on these kinds of projects because they weren't contributing to anything money-making anyway. One item that was shown to us by a Japanese manufacturer (at Motorola in the late 60s or early 70s) was a small black and white set with a magnetic disc frame-grabber. That's all it did; let you grab a still frame, and then look at it as long as you didn't grab another one. I doubt they ever sold any, but it was a completely designed set ready for production.
[Edit - I see someone found it while I was typing - thanks!]
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