I had this thought.

Many IOT devices, including local devices like printers, streaming boxes, cameras etc. may be outdated.

Those may use Wifi but only support WPA2, which can be easily cracked using Kali Linux, a kernel module integrated in Kali, and aircrack.

Many of these devices have an Ethernet or at least USB jack. Ethernet will always work, USB over usb-tethering should work often.

Couldnt you just use a tiny sbc, with a wifi antenna and support for WPA3, and serve the connection via Ethernet or USB to the device?

Like a small plug-in adapter.

Should be rock stable and update atomically and automatically (waiting for you, CentOS bootc, Alma bootc, Rockylinux bootc).

Do you know if this exists or have some caveats in mind?