W101 is fully playable in off-screen mode or with the Pro Controller on Wii U. They'll pop up a little picture-in-picture screen for the few moments in the game when you need two screens, and all the touch screen controls can be done (usually much more easily) with the right analogue stick.
Porting the game wouldn't be a problem; unfortunately actually making any money on a port would be, though.
That's probably the best solution, although that picture-in-picture was nearly impossible to play one the gamepad, so it would be just as hard portably on Switch. I loved W101, but honestly those sections could afford to be scrapped or completely reworked for a single screen.
...but W101 will die on WiiU. It's going down with the ship. I don't think it will ever be resurrected. We'll talk about it in ten years the same way we talk about Dreamcast classics that never made it elsewhere.