Having decided that Raspberry Pi Zeroes running the PiGFX bare metal kernel was the way forward with the small displays, I created some 3D printed 'backpacks' for the unit.
With the addition of some BNC to Phono adapters it works very nicely.
In order to talk to PiGFX you need to use the UART on the Pi Zeroes and I was going to homebrew something from cheap FTDI boards but then ordered some USB CDC boards from 8086.net. They're cheap and do the job perfectly and tidier than I'd have managed.The 'backpack' mounts directly on the BNC socket and I think has come out quite tidily. In the very unlikely event somebody wants to do something similar, I've stuck the design on Thingiverse.
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