You might want to try Ahlusion. I haven't tried a specifically coconut-pineapple
juice from them, but I've had some of their coconut and some of their pineapple juices (pineapple cream, pineapple upside-down cake, coco-berry cream and sweet surrender) and they are excellent. I order 50/50 vg/pg.
Ahlusion's fruit flavors are authentic-tasting and they extract a lot of their own flavors in-house. I don't think their juices are overly sweet. They are just right with the sweetness level in my opinion. It's an option to add sweetener, but I never have. Ahlusion does fruits and fruit creams very well. I've tried lots of them and never found one I didn't love.