My isolating transformer is modern, and is often used with modern equipment that already has a BS1363 plug on. I can't see any advantage in fitting a non-standard socket.
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is it best practice to plug an appliance with an earth wire and extraneous metal parts into a BS1363 3 pin socket of an isolating transformer?
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Under the conditions where I need the live functional parts of the equipment to be electrically separated, yes. E.g. when scoping the line side of an SMPSU. Under other conditions, no, it should be connected to a TN supply with earthed neutral.
I think you mean 'exposed' rather than 'extraneous' in this case, as extraneous means introducing an uncontrolled potential into an equipotential zone (as with a metal water pipe etc). An appliance would only have extraneous conductive parts if it was sat on a patch of damp earth with its cable run indoors.