Twilight Hack should work fine on 3.2U. But use the bannerbomb file which it says on the bannerbomb site to try first. if that doesn't work, just try the others in turn. but it should work. You need to run WiiSCU and install IOS 60. You may want to add the trucha bug into it.
BTW, if you're interested, this app can also let you go on Wii Shop Channel. Just install IOS 61 and update the Shop Channel as well as installing IOS 60, then the Shop Channel will work.