Instead of using 5 gallons of apple juice and putting some of your apples in, why not juice your apples, and then top off with the apple juice. If you have a food processor, you could try processing your apples, then adding some water and juice to that. I'm not sure how many you have, but as far as juicing goes, you'll get about a gallon of juice for every 15 pounds of apples. How many pounds of apples do you have?
Also, if you're going for a classical 'New England style' hard cider, you won't want to add any sugar to that mix at all.
If you go this route, process your apples with a little water, top off with the apple juice, add pectic enzyme, and let it sit in primary for 24 hours, then throw the yeat, and stir daily for about a week. Rack to secondary, then rack again about once a month til you're satisfied (3-12 months).
If this doesn't make any sense, I'm sorry, I just bottled my first batch of Apfelwein tonight...
