This comment may now be irrelevant since it was posted last year, but I thought I might comment as an avid artisan bread baker and fellow Oregonian who has had a similar proofing problem. I’m not sure where I first saw this idea, but it works! If you have a microwave and a pyrex cup, you can make your own bread proofing box.
I put a 1-cup pyrex cup of water in my microwave for approximately 2 minutes. At the point it is very hot and makes a perfect mild heat source. Push the cup back into a corner of the microwave to allow room for your bread bowl, place your bread into the microwave (without turning it on) and you have a perfect insulated bread proofing box.