I feel your pain. My husband builds me a fire in the wood burner when I go down to quilt for the same reason. I am extremely cold natured and he bought me a little ceramic heater about 10 years ago. It really works well. I agree with the poster that said to put it on a power strip with a lamp so that you know it is off. This is what I do with my vintage machines so that I am not always trying to crawl under a table to unplug them.
I hope you can make your new space more comfortable. We have three ducts in our basement and my husband closes them for summer and opens them back up for winter (just because he is taller and can reach them w/out a step stool). A single duct to your area should be too expensive.
Good luck and keep stitchin'!