As far as I know, you cannot "clone" just the System Reserved partition--cloning is typically an entire drive. You could image just the System Reserved partition, but I don't see the point of that.
If you have a way to do a clean install of 8.1 directly onto the SSD, I'd do that. And then upgrade that. And then do a clean install of 10 to the SSD if you want to do a clean install.
If you do not have a way to do a clean install of 8.1 directly onto the SSD, I'd clone or image the entire 8.1 HDD to the SSD, and then upgrade that and then to a clean install if you want.
Regardless, I'd make an image of the 8.1 install after it is on the SSD so that I could easily revert to 8.1 if I wanted to for whatever reason.