Though you could in some ways justify a Church 'stipend,' I don't think it is necessary. The Rectory provides in game food, board, and equipment to members of the Church. The (pretty rare) IC donation can also be shared out, as well.
Beyond that, there are three full dungeons on Ezrite leaseholding land in Barovia alone, plus several caves on that stretch of road with bandits/monsters that we are duty bound to take care of. There's always an easy justification in killing some wasps/bandits/'Legion' for a little bit of income if you need it.
I don't know what the library job is, as I've not been in Port enough to ever see it. If there was something that was going to be added for that, Barovia lore is 'true scholarship' is 'limited to what occurs in the dusty libraries of a handful of dedicated sages, or in the rare temple of Ezra.' So it wouldn't have to be an Ezrite thing, but it could definitely fit and sounds fun.