I actually think that this would be easy, but that may be because MMMV on conceptualization of how you game. SOTI is meant for time jumps, there are plenty of opportunities for sending people into absentia for periods of time (like going to the Alþing frex) and just may need some conventions at startup: Whatever we do tonight is the season, or whatever we do for the next X sessions when we have common groups. we have relatives and allies that are not within a few days travel (allowing things like going to help with births, farm management, etc). Core SOTI (IMHO) is familial obligation. Leverage that to work your problem.