I picked up an Onn 4k streaming Box from Walmart for $20 that uses Android TV. It supports Bluetooth for mouse and keyboard and with a usb hub can handle additional usb ports.
Also supports more advanced tinkering if you’d like to sideload apps such as SmartTubeNext for ad and sponsor blocking on YouTube.
I think you might also be able to load a third party launcher to de-google it more, but I haven’t tried that yet.