I’m quite certain that the possibility for this equals zero. Although some people were speculating Dorwinion were Avari lands, the developers had chosen the northmannish option; IMO more plausible as well. What you described could eventually led to Elves fighting Elves, situation developers would like to avoid. That’s why they get rid of the Elves of Ithillien and Dwarves of Aglarond units for DOM.