An original copy of NTSC brawl? Easy peasy...
Grab Gecko OS - run it from the homebrew channel, use it to launch the game.
or...
Use Softchip.
I'm using the version of Gecko that came with my HBC, when it loads theres an error message: This is not a valid Wii application. Looking into updates and softchip now.
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Actually... why can't you just run it from the disc channel? NTSC brawl works fine in my PAL wii from disc channel - You'll get duplicate news/weather chans, but other than that it'll be fine (because you're on a newer firmware version).
It comes up with unable to read disc. The disc itself is in near pristine condition.
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It's probably worthwhile installing cIOS rev10 while you're at it. It should install without too much drama in 3.4.
I don't recommend upgrading, downgrading or messing around with things such as softmii - they are more risky than its worth.