I would say go for it I have my second batch of wine just using grape juice frozen concentrate. I also added even more sugar. If you do that though add some yeast energizer. You will get some strong stuff.
That REALLY looks good! One of my favorite wines in Pom Blueberry, even though I am not fond of blueberries in their natural state. I think I was reading that Yooper made cranberry wine out of canned cranberries you get at the holidays.