A detachable DOCK with keyboard, additional battery, 3 or 4 USB ports, Ethernet, HDMI, SD socket(s), headphones socket, etc., which can be attached to any smart

A detachable DOCK with keyboard, additional battery, 3 or 4 USB ports, Ethernet, HDMI, SD socket(s), headphones socket, etc., which can be attached to any smartphone via something like VESA mount for displays and TV-s. To use the keyboard, I prefer just slide it, to use like a notebook, out OR rotate it and the phone to form a cross, to use it like a portable gaming console. This way, I can select a phone with good specs, then install LineAge with Linux terminal, and use the phone as a PC for development, note-taking, texting, etc.