Hello.^_~
Please use this Guide -> https://wiiu.hacks.guide/#/ and choose Coldboot Haxchi as Hacking Method and you have near no sorrows.
But you maybe should wait a little,a new Homebrew/Environment is on the Way - AROMA.^_~
"Free" Games installed with WUP Installer - Sure,they are Region Free to play.
Disc Games - I am not sure (because I do not have any NTSC Wii U Game Disc) but no.
Please use this Guide -> https://wiiu.hacks.guide/#/ and choose Coldboot Haxchi as Hacking Method and you have near no sorrows.
But you maybe should wait a little,a new Homebrew/Environment is on the Way - AROMA.^_~