Not me. But others may know, the USB networking (or a serial adaptor) lets you open a terminal and then you can use a regular command. It's documented somewhere on this site.
If my KK3 (or DXG) goes flat I turn on WiFi (or 3G for DXG) and periodically wake it till the date updates.
No, my KK3 and DXG ignore the extended ;date set command in Search. It does list books, but also displays the current full date and time.
You don't need to worry about WiFi updating the FW too new!
https://www.amazon.com/gp/help/custo...MQC26VQQMM8XSW
You can see the most recent K3 is ancient, so either you are already updated, or it won't matter.