Yoshi’s Wooly World and Wii Remote classic

It does work, but is tricky because the wiimote needs to connect to the Wii U too.

1. Turn on the Wii U.
2. As soon as the Wii U logo shows, Press and hold B on the wiimote.
3. If the lights on the wiimote stop blinking, Press and hold B again.
4. If done successfully, you will hear a chime.

This will bring you to the user selection menu, which will have a line stating

(Wii menu will open.)

After you have selected your user, the Wii menu will open.

Okay this CAN work however it does require the TV; you can't do this gamepad only (with or without sensor bar; the menu appears on the TV only). when the "point the wiimote at the TV" screen, plug in your Wii Classic Controller and move the left joystick; a hand cursor should appear. Highlight "gamepad and TV" or "TV only" as you please, then press A on the classic controller. It should boot right to Wii mode without the sensor bar now.

Also...the gamepad has a sensor bar in it! It actually works better than you'd think, though it's definitely best with a gamepad stand. You can't use the gamepad sensorbar to get into Wii mode unfortunately, so you WILL need either a classic controller or a sensorbar to get into wii mode, but after that you can use the gamepad as a sensor bar if you so wish.