I bought an LG OLED Wallpaper signage display; it wasn't cheap, or easy to get, but it makes a fantastic TV, with no "apps" or "ads", just one HDMI input for an Apple TV (which I run through a Denon HEOS A/V receiver). 1080p, not 4K, but I'm 55 and couldn't see those pixels from 10 feet anyway ツ It doesn't have CEC, but it does wake on signal. Well worth the cost and trouble.
A lot of them have RJ45 and RS232 ports and you can send commands through them to make some DIY CEC. You'd need to do some hacking and I don't know if they have public APIs, but it's possible.
