I finally caved and bought the Limited Edition System Bundle just because I wanted that gamepad so bad, despite owning a Wii U already.
I didn't realize the game and Hyrule Historia weren't pre-installed, so I just loaded them onto my old Wii U (since you can't transfer content yet), and synced up the new controller to the old system. Now I've got an extra Wii U I'll toss up on eBay.
I blew $199 on the new system after some trades, so if I assume I was going to spend $50 on Windwaker and I was never going to play those games again, I'm really only out $149 for an extra Wii U. I'll probably list it on eBay or something and see what I can get. Or customize it and sell it for a little more.