If it’s just installing you are conserned about ther is the option of the arch install script. Used that too for my first install and it’s basicaly just typing “archinstall” ind the tty and choosing some values for things like partitioning user settings and desktop environment.

Depending on how open you are to be tinkering with the system I would suggest Arch since it can be very lightweight as a base and then use reteroarch for the emulation (but I’m not sure about the wii emulation…)