You can easily get the homebrew channel to work again in Tiramisu by deleting 50_hbl_installer.rpx inside sd:/wiiu/environments/tiramisu/modules/setup
You do lose Homebrew launching when you launch the Mii channel when you do it this way, but it works great all the same (I never preferred this alternate Mii channel way to launch the homebrew channel anyway, not sure why they push it with Tiramisu). This is what I do, and as such I much prefer Tiramisu, as it does all the good of CBHC without having to pay for a DS title, and you get the quick launch menu on startup again too, and yes you still get to keep the proper Homebrew Channel this way.