Norwegian showed me the way to this thread. We have some pretty good strains up here, Danish Typhoon being the most stable pheno. It´s photosensitive and available from a Danish seedbank (Froebanken -I think). Crossing this with LR2 or Dieselryder might give an interesting cross. There are some local strains in Finland that seem to produce nicely at lat 60, the best I´ve seen so far is ThyphoonxPehkuruder which I´ll be trying this summer (not commercially available).
This project sounds like a very good idea. Do you guy´s trade seeds?