After further digging, and also (for a different keyboard situation) looking into remapping the fn key for similar reasons, I've concluded that this is probably not possible without at least extra software and perhaps a firmware mod.
This post on Super User was helpful: https://superuser.com/questions/65/remap-fn-to-another-keyhttps://superuser.com/questions/65/remap-fn-to-another-keyhttps://superuser.com/questions/65/remap-fn-to-another-key
