I suspect my climate here is pretty similar to yours and what I have found is that raised wicking beds get going sooner than my AP but the AP seems to do better going into fall so the two complement each other.
As long as you aren't letting the water freeze completely I suspect most perennials will overwinter just fine. I have some asparagus that has been in the system for 3 years and started showing some spears about a week ago (big plant but unfortunately the spears are too spindly - I think I needed to plant it deeper (the crown is right at the surface) but could be lots of things and it's a seedling so who knows). Lemon grass grows like a weed and comes back every year as well - It's in a 6 x 8 ft greenhouse that's only heated to 41 F during the worst week or two of winter. The water is connected to outside and gets down to 33 F and actually completely froze the top inch of water in the fish tank this year (The outdoor grow beds where the Asparagus is had snow and ice on them during the same period). I usually divide the lemon grass and just put 3 one or two lead starts back into an 18 gallon grow bed and it fills up the grow bed twice during the year. It doesn't get going until June but I harvest at the end of August and usually by the time fall is over there's plenty more). I don't think you'd have any problems with Rhubarb or grapes although I'd probably grow Rhubarb in soil because it takes up so much space. I'm not sure about the passion fruit
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