The principle here is that God has made man and woman distinctly different. It is shameful for a man of God to dress or to appear as a woman as it is shameful for a woman to attempt to dress or appear as a man. It is no secret that the hair is a distinctive factor of a woman. There are many hairstyles a woman can have that are short and yet still be very feminine. This is perfectly fine. It is an honor to look like the gender God has created you and a person shames themselves when they deny that which God meant for them. Keep your lovely hairstyle! 

I don't know a specific answer at this time. But it seems that this verse has a spiritual meaning, not so much of a literal meaning. I wouldn't worry about how your hair is cut I don't think it matters that much to God, your heart is what matters and it seems that it is in the right place if you would grow your hair back just for this verse. If I come up with some scriptural backup I will post it for you.