SifJar has updated WiiSCU to v0.23. This application gives you the option to install new versions of channels and IOSes without touching the system menu.
I did a quick modification to WiiSCU when I heard that 0.22 wasn't working for installing the latest Shop Channel. I have had a few confirmations that this version IS working on 4.1, so I assume it should work on any System Menu to install the latest Shop Channel. make sure you install IOS61 if you dont already have it, but if you do have it, it doesnt matter if you have the latest version or not.