i think its to bad that they didnt make another Region for the Swedish Pomerania
here is some Maps of swedish Pomerania and where it was located
the Region where of inportance for the Coalition allies as it provided them with a location to land troops after the Prussians had made Peace with Napoleon
the most accurate and easiest would probably bee to just Give the Mecklenburg Region to the swedish (and remove them as they where not of that much inportance during the napoleonic wars
or make perhaps making them protectorate of sweden that way they would exist as a faction but be under swedish rule and Symbolise the Swedish Pomerania