Thanks for the responses, guys. Much appreciated.
The $49 dovetail adaptor from BinTel looks like it is exactly what I need, though I will check with them whether it definitely fits onto a HEQ-5-Pro (and it appears that there are two subtly different versions available as well).
There is a narrow dovetail rail supplied with my mount/OTA which I could attach to the underside of the wide dovetail on the C8, but that would involve some drilling into the OTA's dovetail and a reduction in lateral stability.
The adaptor provides a much more elegant and sturdy solution.
Cheers,
Chris
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