What if we only had the 3ds emulate certain functions to help make up for the 2.4G limitation?
For example, I don't know many Wii U games that need the camera or microphone, also, NFC could be easily ignored as well if you don't want to use Amiibos.
The main reason I wish for something like this to work is due to the fact that I have a working Wii U, however, Nintendo has made it so no controllers asside from a Wii U gamepad can connect to the console before the gamepad tells the console to output to HDMI (which is kinda dumb but whatever). I know the Wii U works, but I am psychically unable to use it since the gamepad it came with was irreparably broken out of the box, and a Gamepad costs about 1/3 of the price of the system itself, not to mention the low availability of them.
The 3ds just seems like a perfect solution to me, they're portable, I have litteraly 3 of them so its not like they're rare, they're easily modded, they have a lot of the same functionality as the Wii U gamepad, etc etc, sure the 2.4G limitation would require some workarounds but surely there should be some kind of solution.
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Oh, I should also mention that Video and Input streaming on 3ds is something that people HAVE done before for PC games on 3DS, so it is not impossible to do. Heck, I'd honestly settle for just having a 3ds as the server with a low-powered pc or a phone on the side acting as the actual gamepad, it would still be a much more portable server for it