On the road of Remastersys, Refracta, Systemback and father Knoppix!
Adding Arch was laborious, but it was possible, because the project started and evolved to be as universal as possible.
Eggs is part of communty of Manjaro.
Linuxmint, KDE neon, Pop!_OS, elementary OS and virtually every Debian, Devuan and Ubuntu derivatives are supported.
EndeavourOS, RebornOS are supported too.
Discussion about penguins' eggs