Re:
I am assuming you need an adapter because the Mini caliper (IS) won't fit straight onto fork mount (IS) over the 203mm disc?
There must be loads of 2nd hand Hope +20mm and +40mm IS to IS adaptors around because I have some on bikes and another couple as spares. You don't need to use a Hope one since the fork and caliper are IS, so most other makes will fit. I've used them with Hope stuff as well.
That's the thing about International Standard designs they are standardised so every component should fit.