I'll move your post to the handloading forum in case someone there knows of an adapter.
The problem will be that the hexagonal steel shaft now on that driver is likely to have been hardened. This means steel tooling won't cut it. Depending how hard it is, carbide tools might cut it, but if it's hard enough it may need to be ground. You're looking at a lot of dollars worth of machine time and effort and possibly the need for specialized tools. Probably not an economical proposition.
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Last edited by Unclenick; April 3, 2013 at 09:08 AM.
Reason: typo fix