I doubt he will ever slip up in the route where you specifically chose to have him rule the village.
It is already a lot to maintain as is with all the paths. adding a "I changed my mind" branch to each path would just be onerous
because killing dasan after he ruled for a while will not have the same results as preventing him from assuming power in the first place.
Don't be so sure. The girls hate being sent to the orcs, Palak and Tomak don't really like it when their girls are sent to them either, Nyra keeps saying the soup is thin due to lack of food. I didn't reach that part while keeping him alive but there's also Umah who's later sent to attack the village because they don't like Gurtak's Red Scull Clan striking deals. The village being attacked with no food, no defenses, no sending girls... Dasan being a coward would probably just run away and MC would become chieftain. Or he'd appoint you to his "aide" and you'd basically rule instead of him while he keeps on fucking all day. Boom, you'd have your 2 options.
On a story standpoint, this holds just fine and reconnects easily. Gameplay-wise, that's one line of dialogue added to the hunters + guards and some to the girls (not forgetting Tia's mom ofc).
Yes, it'd become a lot to do if it's done with all paths, but Chyos has already done so for several of them. There's already several precedents for that and for the Rumah, it denies the players from using a system Chyos took time to develop and quite a bit of content. If anything, it'd allow cutting corners to kick Dasan out and reconnect to the usual branch with a few changed lines of dialogue rather than to copy and tweak an existing system into a new one where you manage the tribe through interacting with Dasan.