If you're not concerned about the risk of prosecution under the anti-circumvention provisions of the DMCA, you should be able to emulate HDCP 2.2 by connecting

If you're not concerned about the risk of prosecution under the anti-circumvention provisions of the DMCA, you should be able to emulate HDCP 2.2 by connecting the computer to an HDCP 2.2-to-1.4 converter[1], connecting the converter to one of the myriad cheap HDCP 1.4 splitters or audio extractors that "accidentally" strips HDCP as a side effect, connecting the splitter to the firewall, and, finally, connecting the firewall to the monitor. [1] I've used both https://www.amazon.com/Monoprice-115242-Blackbird-HDCP-Converter/dp/B01CT7THLO/ref=sr_1_3?crid=1ZDK1HXNWPRG1&keywords=hdcp+2.2+converter&qid=1655871337&s=electronics&sprefix=hdcp+2.2+converter%2Celectronics%2C64&sr=1-3 https://www.amazon.com/Monoprice-115242-Blackbird-HDCP-Conve... and https://www.hdfury.com/product/vertex-4k60-444-600mhz/ https://www.hdfury.com/product/vertex-4k60-444-600mhz/ in similar scenarios, and both worked. Come to think of it, though, while I love my Vertex dearly, it's exactly the sort of highly programmable[2] device this firewall exists to protect against. [2] Over (out-of-band) USB, RS-232, and, using an optional external adapter, Bluetooth. AFAIK, it's at least not intentionally configurable or reprogrammable over HDMI.