You kidding me? Hyper Mode is the fastest way of purification. Besides, if your other Pokemon is strong enough, it should make up for the waste of turn. Or it does for me, at least, but that's because I have a slower, different purification method.
If anything's annoying, it's when your Shadow Pokemon has a nature that makes it go into Hyper Mode less. I had a Delibird, Smeargle, Ledian, among others like that, and purifiying them was the hardest thing ever.