I use the TV remote control for the basic stuff. If I need to type something longer or more options, than I switch to Kore (official Kodi remote by the same developers). You just need the phone to be in the same network.
Never felt the need to connect keyboard+mouse.
This car would be right at home in the cyberpunk 2077 game or in the ghost in the shell anime.
Something tells me that the final car will look more bland, but I hope I’m wrong.