Per Arnie Helinski, it was a bit of both. The neck was originally supposed to be for a custom Roy Clark but something didn't meet the original customer's spec and it wound up just sitting on the shelf being "too nice to scrap".
When the PSP giveaway was being discussed that year, Arnie suggested using that five piece neck on the giveaway guitar and Marv et al agreed.
I'm glad they made that decision. 😁