Call the nearest FAA FSDO and ask them about the 25 Hours of Night Question for Helicopter Day Only Operations. I am thinking the answer will probably be that you do have to have that experience.
Note the particular Regulation specifies "Aircraft" and does not specify "Helicopter" thus that Night Flight requirement can be in Airplanes and/or helicopters or any mix thereof.
Silly as it sounds, get checked Solo on a Cessna 150 or something similar and in a week of dedicated effort you can be done with it.