Any question answered...

With two different colours and textures involved I would not be capable of pulling off something that would satisfy me, nevermind my wife.

I’d still rather try taking the rough edges off.

Have a look at Kintsugi, then find another mug similar to the favourite one and chip out a bit that is roughly the same size, use the files to dress both the chip and the mug, bond back together with gold epoxy, wallop.