Ok, so I've successfully added a ZGA002 to my C8 hub. Took a few attempts, but this is what I did.
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Add Device and Find by Device Type. Select Switch.
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Choose Generic/Other
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Select Generic Zigbee Switch
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Click Start Pairing
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On the Aeotec Pico, push the action switch twice - it's a pretty quick double click
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Once the device is initialised and you've entered the name/location/etc, go to the device settings page. I found the Device Type had defaulted to "Device", so I had to change that to "Generic Zigbee Switch".
There's no power information, but you can at least control the switch. I would say that it's noticeably faster than the equivalent z-wave relay switches I have. Almost no delay at all when switching the relay on/off via hubitat.
I'll obtain a ZGA003 and see if the multi-point generic zigbee driver works.