I don't have a modded wii u so idk, aren't the payloads to boot from on the sd card?

(i forgot to add this) so i think so, but idk

You can use both environment using the environment loader you would need the tiramisu itself and put in the tiramisu folder

Also forgot to mention that you need to install the homebrew launcher for tiramisu. only way to access the homebrew launcher is to open the mii maker

Also one more thing is that you can install a app from the app store that auto boots you into different environments which makes it easier.