@elly If you want something close to Chimera but with more packages, maybe Alpine could be a good choice
You can always use something like Nix or Distrobox or containers if you need software not available in the repos
@elly But yeah, personally I ended up using Gentoo as well (actually I'm building it as an immutable image through Gardenhouse, and I heard Xenia Linux is doing something similar but for all distros)