Most likely gonna get shot down, But seeing how fast does the hunts get nuked, how does defense up buff for freshly spawned A/S rank mark sound?
50-75% damage reduction for 3-10 minutes After spawn. People jump the mark = dies slower giving people a chance to get a piece of it.
Not enough Hunters around? No worries! Just wait for the buff to run out! In my opinion that would work nicely.