I kind of winged it. There might be a standard way to do it, though.
I just took both cases apart. Unscrewed the support screws on both cases. Then swapped the domes. I didn't swap the springs. The springs are the same weight.
I had to manually aim on where the domes should align when swapping domes. That was the hard part. I don't know if there is an easier way.
It took about 3 hours to do at max.