Hi David!
(also looping in @Juergen Pansy, whose support has been excellent)
I have made some progress, but sadly no working Nuki Opener setup yet with the Platea Uno 
Here’s what I’ve done:
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Bought an Opener
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Registered as a beta tester and successfully installed beta firmware 1.3.0 on it, that has Golmar Bus support under the category ‘Generic’. Don’t look under Golmar, it’s not there.
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Soldered a resistor onto the blue wire as per this post https://developer.nuki.io/t/golmar-plus-intercom-system-support/4017
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Wired up the Opener as per this diagram https://developer.nuki.io/uploads/short-url/cW6n7030BzQUnh542xbl9ZLexPA.pdf
However, the door downstairs won’t open, no matter what I do. Even in the beta firmware, the Opener does not give any feedback what is happening (e.g. “can’t read from bus”, “incompatible protocol” or whatever). It just asks me if the door opens and that’s it.
Against better judgment, I also tried the wiring instructions in the app (with the yellow and red wire connected to D and the green and red back into the intercom), but that doesn’t work either. Exactly the same (non-)result. In the end, I changed it back to the situation in the diagram mentioned above and lied that ‘yes, the door opened’, just so I could get out of the configuration wizard.
Some pictures:
My intercom, with the Opener not quite attached yet
Original wiring
My wiring. Please excuse my resistor - I ran out of 82 Ohm resistors, so I made one out of a lot of parallel 1k and 1k8 resistors. I’m out of those too now
I hope the developers can find something, because right now I’m still walking around with keys like someone from the nineteenth century!
Thanks.
Maarten.