I’ve now created a TetWiis forwarder dol and channel WAD, created using the excellent CustomizeMii and the forwarder code from WiiMC.
As per WiiMC, The forwarder will attempt to use IOS58 if it’s present.
The forwarder looks both on the SD and any connected USB drive for /apps/tetwiis/boot.dol to launch.
I’ve tested this on my Wii running HBC 1.08, installing the channel using an appropriate WAD installer and all is good!
If you’ve any concerns about installing channels, please don’t do this unless your adequately protected with BootMii/Boot2 or Priiloader.