Is there a possibility of making every single S rank working like Ixion?

[Reimmi]

Improvements would include blocking Wanderer and Traveler tags from damaging the boss, limiting rewards to the first 24 or so people, and other stuff that emphasizes the FFA nature of the Hunt. Improvements would not include timed invuln on the boss or a "can't pull" timer.

Sounds awful with the ridiculously high number of sranks needed for the achievements