I would add as a notable job that uses hammers Green Mage. As for Maces there are Alchemists and Sages. But really they can always just... give it to a job. There doesn't have to be a lot of justification for giving it to a job really. And FF has actually had Sashes as a weapon, in FFT. They were only used by Dancers and seem more along the lines of whips/scrolls (thinking Rita from Tales of Vesperia) but it does have precedent at least? I think the lack of a job that really uses it or would fit makes it hard to see it happening though. At least to me it seems very much like a mage kind of weapon, probably mixed with unarmed kind of gestures and the like (thinking Golbez as an example, or Dhaos from Tales again).