Update:   So MSI are in upcoming bios release for am4 boards making the headless mode work in all of their lineups from a320  to x570.

With MSI bios flashback button on the B450 boards and up this will be pretty amazing.

https://www.msi.com/blog/with-upcoming-amd-processors-and-combo-pi-bios-is-coming-on-msi-am4-300-400-and-500-series-motherboards

https://www.youtube.com/watch?v=VuhWRoQ5v0E&list=LL_yxer209A7gyjKHy1_ACrA&index=4&t=175s