As far as I know you can't:
This nintendo's original statement:
SD Card Menu
Launch programs directly from your SD Card. From the SD Card Menu you can easily start up channels you've saved to an SD Card. The SD Card Menu can hold up to 240 items, including WiiWare titles, Wii Channels and Virtual Console games. The exceptions to this new feature are the pre-installed Wii Channels (such as Mii Channel, Photo Channel, News Channel and Forecast Channel). These pre-installed channels can only be launched from the Wii console.
but I don't think it shouldn't matter as those channels takes almost no space at all. Only a few irrelevant blocks.