Interfike monk?

Ummm pretty sure that rush already gives the same atk interval cut as fike, if you place fike in your gear you'd need to make sure dont die from having 1 hp all the time (the hp cost by atk autoskill rate is pretty high from what I've been told)

Edit: also you'd need to cry from the lack of mp. Interfike is max-mp-100% I know that rush lowers the amount of mp you have, I've seen Ninjas with only 200-300 mp with fike and max mp+ gears, why do you want to make you mp any lower

Besides why would you want to place all the damn negatives of fike on a class that already has atk interval cut in one of its skills to begin with?

Im pretty sure that: atk interval cut+ another atk interval cut doesn't = even more atk interval cut.
Like how max aspd wont go any higher than max once you reach it. Even with max aspd+% gear.
or how you can't have two buffs with the same name active at the same time.

Iruna does have its limits for the mechanics. I've seen a ninja try using Emperdacle+interfike, not much of a change in speed tbh 

Sorry for my rant

Just don't do it, not worth the time and money you're trying to put in. If theres any class that I feel benefits from fike, so far its only Ninja imo.