Pick two brands in your home market and replace them with two brands that are either offered in other markets or were discountinued. Here’s the thing though, the cars will be the EXACT SAME only the badges and lineup/trim names will be converted.
So say decided to get rid of Subaru and bring in Lancia. You would still have all the same Subarus as currently offered except with Lancia naming schemes. Or, like the above example, trading Buick for Daewoo! You’ll have the same cars but now with Daewoo naming schemes!
Have fun, and if you want to try and name the lineup, sport trims, or just give one example of what a model would turn into with a new branding then feel free!