Install a nintendont forwarder to your WiiU home menu. There's one in
this thread or
Direct link to download. That zip has nintendont inside it as well, but you don't need to copy if over if you have it on your SD card already. If this is a fresh install, then just copy everything from that zip to your SD card.
Put the SD card into the WiiU and start up haxchi, then hbl. Use something like Wup Installer GX2 to install the Nintendont forward. Go back to WiiU home menu. You should see a new icon for Nintendont. Launch it. It will ask if you want to use the gamepad. If you choose "no" it will ask for a wiimote, if you choose "yes" it will just start up Nintendont with the gamepad assigned to the player 1 controller. Nintendont will ask if you want to look for games on SD or USB. Pick SD. Choose your game and play it with the gamepad. Before launching the game you can also configure Nintendont using the menus built into the application. All this can be done using the gamepad. The settings persists though so if you're swapping between games that have something like 16:9 support and those that don't, you'll probably want to change the setting accordingly before launching your game.
Note that Nintendont requires your game isos to be named "game.iso" in order to be seen. See the Nintendont thread for more details.
It's basically exactly what you described. You can install the forwarder to WiiU's NAND or to a USB hard drive. Keep mind the forwarder is very tiny, so even if you're "out of room" on your NAND, I'm pretty sure it'll fit...
With this setup you don't need a WiiMote or sensor bar at any point.
BakerMan
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