You had mentioned buying a third jack stand, & gave the impression the entire car needed to be lifted to rotate the tires correctly. I don't see where that is necessary. If the car fell while the tire was off, it would not be a 1/2" drop. I wouldn't want my car to drop while the tire was off, especially on a cement surface that was being used to support the jack or jack stands.
There is nothing wrong with lifting the car up and even using a jack stand on all four corners. I just don't see the need. Lift the car up, change tire, & lower it back down. Go to the next wheel. I have 4 jack stands, but I have never used them to change a tire. If I am crawling under the car, the jack stands come out.