Try https://www.calculate-linux.org/ - it's 100% Gentoo, with prebuilt binaries ;)
AFAIK Calculate provides more profiles (predefined set of use flags) - instead of just Gnome or KDE/Plasma - it also has Cinnamon, LXQt, MATE and Xfce, as well as one for server(s).
And Calculate also provides binaries for those profiles.