I like the quests / journeys ideas. Something else to consider might be altering the format of the quests slightly so that they provide a nice gold, boon, or item reward in lieu of an XP reward, they could also be modeled as a "repeatable" to simulate an ongoing need to be solved, such as gather some type of resource for the society, provide security at a contested dig site, or escort a courier from point A to B. This could be easily scaled so that one quest could cover several sub-tiers and include a variety of encounters.
For example; using the random d6 tables like in The Confirmation you have a chart for the quest giver, one for the non-combat encounter, and one for the combat encounter chart for tier 1-2, another for 3-5. 6-8, and 9-11.