I am not believing what I am seeing here!
Sea State applies to the body of water you are flying OVER....where or why you are flying over it has naught to do with business....just the mere fact you are exposed to a qualifying Sea State at any point in your flight should be the Criteria.
If this is the level of understanding as an indicator of how some folks think....Lord Help Us!
As to having a very slow Ground Speed on Approach....in the old days we saw that as not being a bad thing especially in really bad weather. You are flying a Helicopter.....Remember?
If you feel the need to whistle down the glide path at near Warp speed....perhaps you might rethink the capabilities and advantages of flying a Helicopter.