Forget it and buy a set of 8's in a decent offset I say.
You'll be spending as much on adapters/spacers as you will on another set of wheels.
I wouldn't have thought so based on that the wheels are worth over a £1000 if bought new.
The h&r spacers are not far over 100 and go up to 30mm. I know a local engineering firm that can make them up cheaper anyhow.