I used the Sunshine game streaming software and the WiiU homebrew port of Moonlight to get game streaming working on a WiiU gamepad. It’s sort of like a bootleg Steam Deck, and it works surprisingly well, but it mostly just made me want a Steam Deck.
I mean connecting the console itself to WiFi, you are required to use the gamepad for most settings.
There’s no controller/wiimote fallback option.