Hmmm. I'd have to say that while technically you appear to be stuck, there are almost always workarounds. In this case, you are right, you cannot create a link to the device overview page once you have hacked your ncf. Therefore, the solution is to make your own device overview page.

Before you hack your ncf, you can add another new device and call it whatever you like...device page, menu, whatever (either that or just add another page to your "start page" device). Then, add a button for each device you have....TV, DVD, CD, Amp, etc just like the device overview page has. Then just make each button jump to the first page of that particular device....ie. TV jumps to TV-1, DVD jumps to DVD-1.

This secondary device menu will mimic the original device menu.