Trying to increase compatibility is good and all, but you don't have to wear yourself off like that, compatibility is already great with Nintendont, keep in mind that Dios Mios doesn't have half the support Nintendont does, so that's a huge progress in my book, I have a few HHDs that don't work with DM but work fine with Nin.Unlikely, keep in mind that they are still hdds which freeze on init di, I only have one which fails on init storage.
In fact, why not edit the first post to include recommended Hard Drives for Wii/WiiU that should work fine with Nintendont that been tested with users? From my testing WD My Passport and WD Essential work fine on Wii, My Essential doesn't work with DM btw.