For VC/Wiiware titles on emu nand just use Crap (v3.3b) and select option Loader = Triiforce mod v2.3 (or v2.2). Note: You don't need to install Triiforce extra app (it's embedded).
Anyway, this supports USB Loader GX too but it's for forwarding channels to ISO/WBFS files, I guess.