well if you have all that as well as your save its as easy as just editing the weapon.
for example the weapon lets say the weapon you wanted to edit was the Demonic Dagger ID: 5800
i would search for the dagger in 4 bytes
and get the following results
after that the item pretty much follow...
although i ended up accidentally changing my nand with no way of going back bc i didn't know you needed a gamecube controller to restore it (i have a wii minus/1.1, which doesn't have gamecube controller support)
and if i find the sd card i have my NAND backed up on, i can not only restore the NAND if i solder the right part in, but i can also put my NAND on dolphin, then i can play dolphin online, like PMEX Remix or MKWii Riibalanced