Champion shards = New champs for lower cost?

So i have every champion that has been released so far from means of many a years grinding away IP. My idea is that since i own every champion, I can unlock new champion with champion shards right? For example Camille is coming out and will be 7800 the first day of her release, if I buy 3 champion shards for 1700 each = 5100 re roll them for champion I can get her for 2700 IP less?
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