For those that are working on them, we do not need to have every quest be do-able. Even 1 or 2 would be enough, just have it check what quest it is and abandon/ignore if it is not one of the quests that can be done. I'd much rather Vorici quest only be completed if it is a 'Kill within this time limit' or 'protect the innocent'. Even when I hand did them, I only ever tackled these two (unless it was a daily) because the others are too much of a time waste.
Tora: Maybe just the 'find the cellar' type ones, not unlike finding a corrupted area.
Elreon: All should be doable, Dominus sticking-around logic circling logic till complete?
Haku: The fetch and bring back one? I hate Haku, esp when I get the flame skulls.
Caterina: Wouldn't think to be easy, the minions run slower so hard to brute force them. Pretty sure there is one or two that are simple, that's enough
Zana: Run any of the 'find the map' ones.
My point is we don't need every quest to be doable, just one or two would be fine.