you don't have to reboot your wii to change the pac files..
just remove the SD card, change the pac file, put it back in your Wii, change character to erase the temporary file, select back the edited character and you're done.
Really?! You can take the SD card out, change the files, and put it back in and it'll still work, with all the codes and everything?! I never tried it because I was too scared to... XD