Do you know anyone local with a lathe? I use the threaded Lee die bodies and a lathe to make various custom sizing parts for my wildcats and experiments. With the threaded die body, all you need to do on the lathe is turn a cylinder that fits and does whatever sizing shape you're after. Maybe a local machine shop could make you a few different bushings for not too much.
As you're finding, if you can do a few smaller sizing steps instead of one large one the result and success rate is usually better.
Or, maybe you can just buy the formed brass from someone.
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