Thanks I got it all taken care of now, I'm on 4.1U and everything's working
Is it possible to make the Wii immediately boot into GX instead of system menu?
Yup
Install priiloader (modmii does this if you follow the guide)
Download the complete GX 2.3 package - gets you the forwarderV4.dol put it on the root of your SD
Make sure you have installed the forwarder .wad to your wii
start priiloader, install the .dol file in the settings page
Set priiloader to auto start the file
I do this to ensure the kids can never get to anything other than GX (and homebrew apps through GX)