I lived in Seattle for a year. If I lived there and I could, I would probably put up an open-side structure with a polycarbonate roof to keep the rain off the plants. Or an unheated cool house.
The Den nobile you show is flowering better than most, because it had bright days and cool nights. If you didn't read the link I posted a few days ago to a Den question from Dr. Dave, you might find it interesting.
__________________ May the bridges I've burned light my way.