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We took a close look and multiple people (more experienced than I in that regards) are sure that this is not PCI express mini. I decided not to pursue this path further (though would still appreciate if anybody already knows and could share this knowledge). I would need significant time myself and from my colleagues assisting me, which I don't have and don't want to ask of them.
I will now approach my goal differently. What I want to achieve is wireless page flipping. I still have the serial port available, plus WiFi. My choice would be to use a bluetooth2serial device and some "camera shutter remote" (search Amazon with these words and you see what I mean). This sounds like the most energy efficient version (ideally using BLE), but I haven't found a good solution yet (the nrf51822 seems like a good choice, but then I'd need to have both receiver and sender with it, and it seems there is no easily available source code yet). For now, I got hold of an ESP8266 and will build a remote that sends keypresses over wifi (already have a small script running on my Kindle PW2 that listens on a UDP port and depending on the received packet flips the page for- or backward).
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