You should follow your modmii generated guide.
You should also run Korean kii homebrew and ensure the Korean key is removed from the seeprom.
Sure you could reduce the number of WADs modmii suggests you install by changing its options (active ios and extra brick protection for example) but I don't think you should. Most of these 44 are updated IOSs that are mostly needed for official functions (I. E. Playing disks from the disc channel). If u don't install updated active ios's and block updates with priiloader, you may find yourself in a position where u can't play certain games from the official disc channel. Won't impact backup loading which uses custom ios oc.