so I finally got both going, I concentrated 4.5l of pure apple juice by freezing which gave me 1l of juice at SG 1.080 which I topped up with sugar to 1.100, suphited, added nutrient (4x by mistake) and pitched with EC1118. it's developed a little krausen and time will tell the rest.
the dregs came out to 3.5l at an SG of 1.036 which I topped off with honey to an SG of 1.056. when I get some more EC1118 available I'll pitch it. until then it's going back into the fridge.
the experiment is on!