Hey guys. Thanks, Conmore, for the guide.
WiiFlow never worked (Disc_Wait Failed) but I got super close with CFG USB Loader. I remembered to set DML to DM.
DIOSMIOS v2.8 never successfully installed for me with MMM/YAWMM but 2.9 and 2.10 did with WAD Manager GUI. But whichever was installed...