It will help in a normal situation. Even late. But this is not normal. You boiled it and set the pectic enzymes. I do not think it will help in this situation but if you want to try use 1 teaspoon of the dry per gallon and let it sit for at least 2 months.
Primary: 3 gallon cider S-04
Secondary: Valentine Apfelwein Clone 1 Gal
Bottled: Halloween Apfelwein Clone 1 Gal
On Deck: 90 Shilling Clone