Iain:
Unless you bought the dongle and mouse together as a pair though, it is unlikely that the dongle can operate in HID mode..
Yes. I didn't know much about HIDP. Looking further into it, it became clear it doesn't apply in this case.
O.k., time to close this thread. Sorry to have bothered you guys with a problem that turned out to be a non-compliant device.
Many thanks to Marcel and all the others for trying to help and for all your work on bluez!
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