Space saver spares are ONLY intended to get you to the nearest place that can replace your tire ASAP..
I had a flat not long ago. Of course, the tire the nearest dealer had that would fit my car was not the same tire that had the flat. Once I got home with the non-matched tire, I called around for the right tire. I kept the mis-match tire because it has very few miles on it, and it could give me time to find another matched tire if I ever need another one.
And I rotate my own tires. I have a floor jack, jack stands (I only use one for this) and a 'speed wrench' with a socket that fits my lug nuts which makes it quick and fairly easy to do.