Have gamed out the Vargr incursion into Corridor during the Rebellion era using T4/Imperial Squadrons+Pocket Empires (i.e. tweaked Fifth Frontier War boardgame rules with added crunch). It is a lot more doable than I imagine the Aslan incursions to be. Of course, the key point is that Imperial Corridor Fleet has departed for Core, so only local forces remain on the Imperial side.
I haven't gamed out the Aslan incursion. For starters, it is hard to know what sort of counter to give an Ihatei fleet.