[sdiupIGPWEfh]

I am ashamed that this has never occurred to me and shocked that I have never heard it elsewhere. Brilliant.

Apparently, the "Nintendo WiFi Network Adapter" was once a thing in Japan, and it did have a router mode.

https://www.wired.com/2008/09/nintendo-announ-2/

https://www.famitsu.com/game/news/1217892_1124.html

https://kotaku.com/nintendo-announces-wii-ds-wifi-router-bwa...

[laumars]

You can also use a USB Ethernet dongle with the Wii (that’s exactly my set up in fact).

This obviously doesn’t help DS users though.

[salamandersauce]

They did sell a USB dongle that would take a PC's net connection and use that to make a WiFi access point for the DS or Wii.