Idk if kids are a target group of Nobara Linux, but I heard that’s good for gaming.
Rest sound good. Don’t forget to give them lots of productivity tools… OBS, Kdenlive, LMMS so they can practice shooting videos, create music… They’d need LibreOffice, maybe an IDE to learn coding, or something to create a website. As a kid I had a lot of fun tinkering with the Free Software tools, next to gaming.
Test the website blocking, if you restrict for example porn. Nowadays the browsers all try to do some privacy enhanced DNS over HTTP and that might circumvent the default DNS. I’m not up to date with the current solutions to restrict usage… Maybe someone can chip in, I’m pretty sure that’s available.
I bought my smart bulbs at Ikea. Idk how the price compares to the brands you mentioned.
I think smart home lighting is overrated. Schedules are nice for holiday and outside lights. But I don’t use any “smart” solutions in most rooms. They have limited use in the hallway, though (with a motion sensor?) And in places where you want to dim them, like next to the TV. That’s my opinion.