You are the second person I am aware of who has somehow managed to do this (getting his SD card into the disc slot). I can't imagine that bricking your Wii, however. Fooling with CustomizeMii yes, doing this no. I have moved your thread to the bricked section of the site.
To answer your questions in the second paragraph: yes and yes. We can say spoonfeed all we want, especially when you say you've searched google with the implication you have not searched wiihacks. In any case, mauifrog's your guy on the brick issue --- I'm sure he'll offer some suggestions before you go the route of replacement. Heed him well, he has forgotten more than you or I will ever know --- I'm saying he's that adept, just to be crystal clear.