custom replacement for internals of a coaster brake

Well I got a hub adapter for my sprocket that mounts on to the hub so I don't have to ruin anymore spokes. However, the added space of the sprocket spreads the internals of the coaster brake and it will not fit together correctly and doesn't look like it can be saved. I'm not worried about saving the brake. It is a really nice wheel and I paid alot for the adapter and they fit perfectly, but I need to find a solution for the inside of the hub. I'm thinking about making a mold of the interior of the hub where the coaster internals went and molding my own piece of metal for it with a hole bored out for the axle and maybe a ball bearing in there? Is there anyone who already sells something like this? Or has anyone had this problem?