Priiloader is included in the fix I posted so not sure why you couldn't get to it from MMM. You also said that the only thing in App Manager was the Hackmii installer? The Hackmii installer wasn't in the pack so it sounds like you didn't format your SD card as I suggested (your apps folder wasn't setup properly). Sounds like you're back up and running regardless so that's good news! If you followed Mauifrog's guide, your Wii is setup correctly so there's no need to do anything else.
I do recommend removing USB LoaderGX. Can't say this was the cause of your issue however it's better to be safe and use CFG or Wiiflow instead.