If you're using Haxchi to launch the wii u patched system menu you can rename the c2w.elf file to homebrew launcher.elf and place it in the homebrew launcher folder (wiiu/apps/homebrewlauncher) on your sd card. Rename your old homebrew launcher.elf and place it in a new folder
Now when your wiiU boots press the home button on the black Haxchi screen
and select homebrew launcher as the auto boot. (These setting will be saved so You'll only need to do this once) Now every time you boot up the wiiu or return the homescreen, the c2w patch will automatically be applied.
*Optional*
To access the homebrew launcher with ease you'll need to use haxchi to patch another ds title to create a new homebrew channel. Then Use the costom set path text file to set the path to your original homebrew launcher.elf that you put aside earlier.
Or use the online Exploit method to boot homebrew