I had to get an oil change in quick since I was traveling and I was surprised how many places I went to didn’t have what I needed, even Valvoline or jiffy lube didn’t have the right oil and were worried about damaging my engine. Changing oil shouldn’t be this complicated.Here is a list of licensed dexos2 oils. They are not as easy to find on the shelf as the dexos1 oils.
As far as running the dexos1 oil, I wouldn't go too long on it before draining and refilling with dexos2 since the dexos2 is spec'ed for use in diesels. Also might be a good idea to install a new filter when you drain and refill with the dexos2.