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Driver display section will be a standalone unit. 1 input connector is feasible. This will also be separate than the removable cosmetic section of the dashboard. 4 displays, Power for Pi Zero, Pi Zero, and CAN.
Off the shelf CAN transceiver on the driver display Pi (This one uses an MCP2515: https://copperhilltech.com/pican-2-can-bus-interface-for-raspberry-pi/). Also see the instructions here (https://www.beyondlogic.org/adding-can-controller-area-network-to-the-raspberry-pi/) We can make this a hardware task.
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