Actually US wheels may work. Most cars that use a hex are still pinned on the axle. I'm not familiar with the Academy, but it may be the same. If this is the case then it is a matter of removing the hex to expose the pin. Then it is a matter of making sure the axle size is compatible. If the axle size on the car is smaller you are out of luck. If it is the same or larger you can drill it to fit. Then just pay attention to offset and you should be set.
You may also have to add some sort of shim, like the cone washer on an Associated car. It may be that the hex also braces the stub axle between the pin and the carrier. If you don't take care of this you won't like the results.