Just tried again. Click, click, click. The drive can't focus. That noise is exactly when the lens (!) moves up and down trying to find the data layer.
Another nope, probably an IOS and software "issue" (can't call it an issue since it isn't intended to work): An external USB CD drive is not detected by Wii-MC-SS and/or WiiXplorer.
If somebody has a working Wii Linux installation and an external CD drive: Please try if it plays CDDA. Of course this is useless beyond any description. But it would be fun!