Asahi Linux already does use an open source UEFI implementation (U-Boot) to boot Linux.

https://en.wikipedia.org/wiki/Das_U-Boot

The Asahi installer will also allow you to install UEFI alone, in case you want to use UEFI to install some other OS.

The hardware management engines in modern x86 chips are backdoors running at a higher privilege level than the installed OS's kernel.

It's hard to see them as anything else.