i have been fiddling around on yawm when i might have figured out how to make custom wii channels :)
you can go download the latest version below. i'm a little slow when it comes to updating the website, so please bare with me. however you will need the yawm application and install it via hombrew channel. if you know how to get that set up, then everything should work just fine.
i'm also working on an online guide which goes more in-depth about how to make all this chaoticness happen, and should be fairly simple and straightforward to use and read. the first edition will be released shortly :)