Hi,
usually I do not suggest to use ReDJ the same way as Redirector, because a single ReDJ rule can redirect many URLs to many (different) new destinations, while Redirector works as one-to-one redirection tool.

But in the last ReDJ version (1.7.5) I have added a new feature to support one-to-one redirects efficiently, using the errors trace function. Each error logged can now be redirected to a new page. So we could create a SQL script to convert your redirection to ReDJ rules or errors.

The only issue is 1.7.5 Enterprise will be release in the next few days, and the Community after a while, so if you want to go this way and can wait some days there are no problems, otherwise just let me know and we can find a solution.

Kind regards,
Luigi