It may be pricey, but this 15.6-inch portable monitor seems to have checked all the right boxes for both gamers and editors. Hopefully its black-white and gray-gray response times won't be as slow as on the smaller 14-inch version.
https://www.notebookcheck.net/GMK-Xpanel-2-4K-portable-monitor-with-HDR600-and-AMD-FreeSync-now-on-sale-for-429-USD.555081.0.html