Modify LetterBomb for different MAC address

Hello, I was wondering if there is a method to modify Letterbomb for use on another console by changing the MAC address without having to redownload the zip file again? I ask this because the MAC address for my friend's Wii is not being recognized by please.hackmii.com and I've received no answers as to a resolution to this problem in the past. So, since the prefix won't be added due to it not being a recognized Nintendo prefix, can I modify my downloaded package for use with their prefix?
Thanks!

Nope, the only way is through the website.

I'm pretty sure there's a lot of information available on the Wiki for how the message board works. I'm not sure but you might be able to disassemble the exploit and resign it, etc. but that would be a lot of work.
A much easier solution would be to buy/rent/borrow Super Smash Bros. Brawl and then use Smash Stack.