It's perfect for wine - I made my first batch of blackberry wine from a failed jam. It had jam sugar which is high in pectin, but it was never noticeably cloudy. I say go for it. Aim for about 2kg of fruit and 1kg of added sugar per gallon (so your jam quantities are ideal) and top it up with cooled boiled water. Maybe squeeze in the juice of a lemon in each and add a mug of stewed black tea to boost them up.