I don't know if this is possible through the steamworkshop because its the only paymod for a game iam aware of. Everything else comes through DLCs directly from the company who made the game. But i could be possible through the marketplace in some case. Like different liveries and items for other games. But i don't know how steam handles this kind of stuff. They only other 3rd party payware mods, which i know, are for DCS but thats also different because eagle dynamics included them in their platform. Maybe some other flightsimmers with casual flight sims can talk a bit more about this, i am just into combat flight sims.