Your diagram didn't come out very clearly, so it's hard for me to really evaluate this idea.
That part of your description puzzles me. The XLR port on the Adam is an input, not an output.
It seems to me it would be a lot easier just to get a long USB cable (or a USB extension cable). I know you want to get rid of cables, but even if this worked, it seems like a lot of trouble to go through just to connect up a POD to your computer. Since you're planning on connecting a USB cable from your POD to your IOGEAR device anyway, why not just connect it to the computer instead. You wouldn't be increasing the number of cables you're using, and you'd save yourself a lot of headaches.
I totally get the idea of reducing cable clutter, though. For me, the biggest issue isn't the number of cables, but how they're organized. No matter how many cable ties and other cable organizers I try, it seems like I always end up with spaghetti. Good luck!