The lockring thread is a different diameter (smaller) than the sprocket thread, so the lockring wont fit on even if you could find a thinner sprocket. And as it would be threaded in the same direction as the sprocket it wouldn't really achieve much more than locktiting the sprocket, which isn't much.
If you want to go ahead with it, the only way I can think of is to cut part of the base of the sprocket off, and then screw both bits onto the hub individually. But that would be pretty near the same as just putting the whole hub on.
The lockring thread is a different diameter (smaller) than the sprocket thread, so the lockring wont fit on even if you could find a thinner sprocket. And as it would be threaded in the same direction as the sprocket it wouldn't really achieve much more than locktiting the sprocket, which isn't much.
If you want to go ahead with it, the only way I can think of is to cut part of the base of the sprocket off, and then screw both bits onto the hub individually. But that would be pretty near the same as just putting the whole hub on.