A while ago I approved a program called
ReXplorer, which was made mainly for Replay management. However it also has a sub-function to generate map pictures of any size you want, which is perfect for pulling minimap pictures -- and it looks like that includes from protected maps too!
If y'all want to see actual examples, check the Map Spotlight. Notice how there are pictures up now! (Though I'm sure they weren't up before simply because Moose is lazy)