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As the VHS decks do not take sync, you are looking at a digital switcher that handles NTSC via a built-in frame sync to buffer the video by one frame or so. These have been around for a long-time and are available used.
The Panasonic WJ-MX50 is a sample of the style. I found 3 on Craigslist for between $800 and a high one for $3200. I think it does audio also so you may want to look for a lesser version. JVC may have been in this game also.
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“Once you eliminate the impossible...whatever remains, no matter how improbable, must be the truth." Sherlock Holmes.
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