Shipping is easy - wrap them in bubble wrap, put sheets of cardboard on the front and back faces, bubble wrap that again and secure with packaging tape and then send via
e-Go. Charges would be low for just one rim - I've sent full rims and tyres like that to Perth via e-Go before and they didn't get a scratch.
Are the rims you have Hyperblack (shiny medium-grey look) or Gunmetal (browny darker-grey look)?
Reference image - Gunmetal is on the left, Hyperblack is in the middle.
I was going to procrastinate, but I put it off...