In order to be able to Further configure my system, I am looking for a fork of my current OS (artix with openRC as init system) in which i am able to compile every package from source in order to Further configure it with make flags. I am currently not using gentoo, and because the packages in its default repos are only updated when necessary, and the break-my-gentoo repo is more of a joke than an actual replacement for arch. However, if someone can recommand me a repo with similar package updates as arch, I would be looking at installing gentoo.
This is kinda the opposite of what you’re asking for, but might address the reason that you’re asking the question?
CachyOS is an Arch based distro, but it precompiles many arch packages (and some AUR packages) in several versions, optimised for either x86_64-v3 or x86_64-v4.
So if your goal is “optimised” rather than “compile yourself” it might be worth looking at