Xbox One X apparently supports HDMI-CEC now. Found under display options, TV & OneGuide, Device Control. : r/xboxone
Monoprice Blackbird 4K/1080p 1x2 HDMI Splitter | 4K@30Hz, 1 Source onto 2 Displays, USB Powered, For PS4, Apple TV, Roku, Xbox 360, Laptop, Blu-ray Players, etc - Walmart.com
Amazon.com: UGREEN HDMI 2.1 Switch Aluminum Ultra HD 8K 3 in 1 Out HDMI Splitter with Remote Supports 4K@120Hz, 8K@60Hz 4K@60Hz 3D HDR CEC Dolby HDCP 2.3 Compatible with PS4/PS5 Fire Stick
HDMI CEC | AVForums
Pro 360s HDMI'd - GameSpot
Amazon.com: Y.D.F Xbox 360 HDMI Converter, Xbox 360 to HDMI Converter HD Link Cable for Xbox 360, Xbox 360 to HDMI Support 720P / 1080P. Compatible with Xbox 360 and Xbox 360 Slim. : Video Games
HDMI-CEC support ? - Microsoft Community
Xbox will get improved HDMI-CEC and new controller features - FlatpanelsHD