you weren’t specific about your use case, but if running media-consumption apps is your thing, there’s a LineageOS AndroidTV port for Raspberry Pi. the most polished UX, no Google spyware to slow things down, super-competent hardware (avaialable with up to 8 GB RAM), supports HDMI-CEC (you can use your TV’s remote), has a wired LAN port, and you always have the option of installing a linux distro.
all-AMD system and don’t buy new stuff, go a gen or two back; new keyboards and mice and case.
can’t help with the mentioned games. weening them off that corpo spyware is good in the long run but it’s detrimental to their social life.