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I think these are all probably beyond my capability for making a decent hash of it, I fear.
I'm going to try a few shim washers as a quick and easy bodge.
Not that I'll be able to use the tap yet - they used copper tails, one of which is corroded to the old tap, and the pipework is about too far away to use the tails that came with the new tap.
NotThamesWater
Did one of these recently for a builder friend who was in trouble. I used a hole saw with a device that allows you to place a hole saw of the correct size in the existing hole and use it to guide a larger hole saw. Cut the larger hole 5mm down to fit the tap base and dropped it in.
Horrible bodge but you could use a version of the method to cut a clean hole and then plug it with a closely matching wood and drill that plug for the tap. Or fill it with something like repair care (or another epoxy resin designed for rotten wood). That could leave you with some decorative issues but it will never rot!