@Edhawk
Actually all the articles that I have found have the same base: a Linux system (Ubuntu, Gentoo, etc.) in which to generate the keys and sign the bootloader's files with them. Of course, it is unthinkable to propose this method to the general public. Hard and tedious.
I think that Acidanthera is in the first step of creating a simple method (if possible) to do the same task from macOS. There is still a long way to go but this team is capable of achieving it.
Basically we need linux because sbsigntools and efitools only exist for linux. The other required tools, openssl and keytool, can be used from macos.
If someone could port sbsigntools and efitools to macos (I have no knowledge for it, not even close to it) the task that is done in linux could be done in macos but still I think it should be simplified.
Anyway, it is the beginning of the road, we will see where it takes us.