See the info in the following link:
http://encyclopedia.stateuniversity.com/pages/6117/Dorset.html
and the only thing that stands out in that info that makes any plausible link to your theory, is the date 940 A.D. as the period in which the place Dorcester obtained it’s name, and that date was during a period of Norwegian and Danish inroads into the demographics of the British Isles.
If there are more direct links, I haven’t found them.
Maybe what is common about “Dorset” has to do with how, in the English language experience, the ancient people of Eastern Canada were given that name, and not those ancient people themselves.
Geeze, lighten up. I’s just a shaggy sheep story, that tried to pull the wool over a few eyes. It is called “humor”.
...and it’s at least as sound a “theory” as Gorebull Warming.