I'm pretty sure someone already did this exact thing.
I'll see if I can hunt it out but it essentially took the streams and played them all at once with a sync delay button.
Edit:
It was a thing - https://www.giantbomb.com/forums/general-discussion-30/i-made-a-thing-to-watch-gb-videos-simultaneously-l-1881738/
Looks like it doesn't work anymore
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