Hi, There seem to be a solution called "EXP GDC beast" for laptop without a thunderbolt 3. Have you looked into it? https://www.google.com/search?q=EXP+GDC+beast&rlz=1C1GCEV_enGB877GB877&oq=EXP+GDC+beast&aqs=chrome..69i57&sourceid=chrome&ie=UTF-8 I wish I could help more but i have literally zero experience with that kind of setup. Hopefully you can make something out of it. The other way would be to look at gaming streaming services like "shadow" and the new Google stadia , this would nullify the need for an upgrade to your graphic card. I hope this suggestions help somewhat.
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