Sorry for my late reply, but I was thinking about that Quest system.
I deliberately postpone the quest/items/equipment/XP dialog that RPG’s have, so I can focus more on the action adventure aspect. And at first glance the quest thing is part of that dialog (so postponed).
But I might have found a quicker way to implement a simple system for that. What I can do is show the quest on the top right of the game window. And with screenplays you could set this quest text.
Would that work for you?