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"Nordic Semiconductor nRF51822", interesting... I assume that is a the RF link to the Clicker and (probably) Touch. If so, this is somewhat disappointing as it will mean that the touch controllers are only compatible with Oculus headset and can not be used separately or with another headset configuration.
You might find that the 'debug port' is intended _only_ to be used during factory programming/test. Makes sense to make the door a tight fit to protect terminals from water ingress. Removal solution might be to super-glue a tether to it and then pull it out. Would need a replacement door to re-fit afterwards.
To make a random guess it would be a JTAG port for programming flash, but protected with E-fuses once programming/testing is complete.
Overall this watch is an impressive piece of engineering, but I still don't think I'll be buying one.
The board you are calling the 'RF board' is most likely the propriatory link for the controllers (as they had on the Xbox/Xbox360), and just plugs onto a USB (???) connection on the motherboard.
Why they would use an external WiFi/BT board, is a bit of a question.... outsourced engneering? I wonder what connection protocol it uses to motherboard. Nice stitching of antenna cable to case.... not!!