That's not what Nintendont is, it's more like a bridge between an emulator and a virtual machine which runs Gamecube games natively.
The Wii U has no MIOS(Gamecube Mode) but it can use Nintendont, so it wouldn't require TWL_FIRM or AGB_FIRM.
To answer you question, you have to put the body_lz file in a folder inside of the themes folder, and use Yellows8's HBL cia to run HBL to run the CHMM2 .3dsx to install it.