Willwoods disks with 9-inch-dog-dish-hub-capped rims?

I'm not sure what the problem is. Do you have Wilwood brakes with small bolt pattern hubs already? Stockton Wheel will make you a stock-style steel wheel to your specification: bolt pattern, width, diameter, and offset. So just take measurements and order the size that works with the brakes, after confirming with them that the wheel will take the dog dish.

If you don't already have the brakes and hubs, then you need to find out if Wilwood actually makes a small bolt pattern conversion. If they don't, I believe Stainless Steel Brakes does.