Four last years I propagated Japanese azaleas. One of them lent itself well to be sized out of a small tree. Here is the first flowering this year which is a little bit to late considering the cold winter that we had this year.
naoki, R. camtschaticum or the closely related R. glandulosum would work fine for you. Although I've never lived in such a cold climate, reports indicate -50 F without trouble...
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