Did you see this proposal from another thread here, or from archival research, or books or articles?
I ask because I did some research for a paper in the national archives, the COSSAC (Chief of Staff Supreme Allied Command) files.
I reviewed the op plan (short single page form) for the Fortitude North Deception plan.
I also saw the order for Jupiter, dated only as early in 1942, focused on northernmost Norway, with intent to also effect Sweden and Finland's position in the war.
But I also saw two plans I had never seen referenced in any prior books or journal articles, "Atlantis", and "Dynamite."
Atlantis from 1944 (or possibly late 43) was a real contingency OPLAN involving invasion of central and southern Norway, with planned exploitation into Denmark. I think it was meant as a potential alternative in case Overlord had to be cancelled or failed.
So this was broader in even initial scope than Jupiter. It resembled Fortitude North written as a real plan.
Even more obscure was DYNAMITE from 1941. It had less text and a sparser outline than any of the other plans, but had a map illustrating invasion arrows towards southern and central Norway rather than the north.