Ill elaborate a bit for you then, After the conquest there was a marked change in the english military system, the old Anglo saxon elite were now displaced, they were of course still a threat to stability and were encouraged to leave, they had no means of advancement in the new order of things and went to where their talents were of use( Talents as fighting men, these men were the backbone of the old army, which was now supplanted by the Norman style army.
From the 60s through to 80s they went in increasing numbers to first Denmark, moving through scandinavia and on to constatinople to become a major element in the Varangian guard.They were aparantly brigaded apart from the scandanavian elements of the guard.
Earl Sigurds group sailed directly to constatinople before heading north, not being content to serve as gaurdsmen, and now being in sufficent numbers to retake the recently lost Cherson Byzantine province for the emperor.
It all depends how you see the effects of a Norwegian conquest being differnt to a Norman conquest, if you take the view that Northumbria was half way assimulated prior to conquest then the rest would go the same way in time and so not dislocate society to the same degree that the norman conquest did then this episode of history is of no use to you.
Hannibal
