They do officially support the Permissive security policy, and it is intended to allow you to boot custom kernels. Running a fully-untrusted operating system ke

They do officially support the Permissive security policy, and it is intended to allow you to boot custom kernels. Running a fully-untrusted operating system kernel is an intended feature, even if they aren't going to give you support if something breaks in the upper layers. See https://support.apple.com/guide/security/startup-disk-security-policy-control-sec7d92dc49f/web#seca904a9a35 https://support.apple.com/guide/security/startup-disk-securi...