Could you have Haxchi boot an installed title like this?:
Code:
Config.txt
a=/vol/storage_usb/usr/title/00050000/1018dc00/code/Block.rpx \\ Super Mario Maker
b=/vol/storage_usb/usr/title/00050000/10176900/code/Gambit.rpx \\ Splatoon
default=/vol/storage_mlc01/sys/title/00050010/10040100/code/men.rpx \\ Wii U Menu