one more option
- use a projection virtual keyboard
then the keyboard face of the laptop just has to be a plain white surface.
Example existing device: https://www.amazon.com/Wireless-Projection-Virtual-Bluetooth-Keyboard/dp/B00LFJBP0Y
BUT with the intention that it is
a) integrated within the laptop (and hence not separate and wireless and battery powered), and
b) completely customisable (I get the impression that existing devices on the market only do one layout).