Well first off you can never remove a hair glitch yourself. Roscoe has to do it for you.
BUT-if you want to keep 1 single hairstyle but not have to go through the whole glitching process again just select "bald is beautiful" hairstyle. If you get the wrong hair just undo and click it again!
You will have 1 hairstyle. And whenever you want two again you can just click another hairstyle!
Works for me!