You can use an USB attached GPU to drive the second screen. Thats what we do for our kiosks. Thunderbolt would have meant replacing all of our screens.
SEE2 Extreme UV250 USB External DVI/VGA Video Card
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2021 Model Y
2005 Cayenne Turbo
2012 Panamera 4S
1980 911 SC
1999 996 Cab
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