Home button is for CBHC, not haxchi.
Haxchi menu is managed with a configuration file where the user link a button to a homebrew path on the SD card.
get haxchi installer, extract to your SD card.
look in sd:/haxchi/ folder, edit the text file, and set the button to what you want.
then, reinstall haxchi to write the config into your console's memory.
if you want homebrew launcher by default, :
default=wiiu/apps/homebrew_launcher/homebrew_launcher.elf
a=sysmenu
if you want to automatically patch your system to CFW instead of launching HBL, swap "default" and "A" values.
Edit: Only swap the button name! don't copypaste, or delete the "fw.img" line.
I'm sorry for the mistake I wrote in this message and the brick I could cause.
I wrote "sd:/wiiu/" instead of just "wiiu/". Thank you to Flump for telling me and preventing more user's issues.
When you launch haxchi, press (and keep pressed) a button matching your configuration file.
if you press "A", it will launch the homebrew or the choice linked to line "a" in the config file.
"sysmenu" is CFW.