Not sure why this key is so important to you. The key from the NAND dump is both included in the dump itself and saved as a separate file in bootmii beta 3. It seems to me, since you've been fiddling with IOS60 that we probably should first re-install that, but use a different one as the one you have clearly doesn't work so well. IOS60patched.rar
Failing that a full 4.1 system menu wad install should put it back correctly/ 4.1E-RVL-WiiSystemmenu-v450.wad - 4.1, Europe, PAL
I'd probably want to verify that I had bootmii installed as boot2 before I went doing stuff like this though as fiddling with IOS60 can render preloader inoperable.