@Andrew_Rowe @frankb @OMR thank you all for your suggestions about using the ZenSys tool; some initial feedback as follows…
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I used the Aeotec version of the ZenSys tool (just to avoid the mentioned hassle with Silicon Labs logins). The Aeotec web page is here, and their direct download here. (note: you need to ignore Windows nag about the installer being unsigned). And just for completeness the Aeotec Z-Stick cloning tool is here.
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The ZenSys tool process described here enabled me to successfully remove one ‘ghost node’.
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The ZenSys trace logging also identified one device that was flooding the network with power meter reports at ca. 100 milli-second intervals. And in OpenHAB Thing configuration I could change a device parameter to stop that.
I guess that items 2. & 3. above will probably have fixed my problem; but I will let it run for a day and report back with the final answer.
PS I have another question concerning Security Keys: The Aeotec clone tool shows that my Z-Stick has a certain key, and OpenHAB Thing configuration shows a different key. Should these values be the same? Or does it matter if they are different? Indeed are these ‘keys’ referring to completely different things?