I just wrote this message over there so you might want to read this below first before you go thinking its a great work around from Rednand, its not, trust me! you do not save any time over Rednand in fact it takes longer in theory.
Its not as great as it seeems! I prefer myself to just keep using Rednand, its easier. I was testing this method out last night and its not that great as it seems because you have to boot into the cfw/fw.img menu and install via wupinstaller so you have to boot the browser/homebrew launcher again every time you want to install content to it and also to use the dlc or eshop games again you have to boot back again into the cfw/fw.img so its not actually been used on the main system menu when you first boot up the wiiu, you still have to boot into some sort of custom menu at least with Rednand you just boot into Rednand and you can install multiple content via the System Config Tool from the main menu in Rednand, instead of having to go through the browser steps again to use Wupinstaller to install content to the main menu! Sorry but I do not see the point over Rednand, its more hassle than its worth doing and it certainly does not save time over Rednand booting/installing.