I think non-setup wifi on devices will be the equivalent of the blinking clock on VCR's of yeaster year. Who cares if it is setup, why bother.

Tuxpaint is the best drawing / art program for kids. I have used it with ages 3-6 to get them using mouse and keybord. It allows for simple modes so it can be tuned to the level of the user.

Large UPS are common for data centers. But they are expensive and time consuming to maintain. In a data center the cost and time are justified. But for a home I would question the value.