drupal 5 and drupal 6

We have a Drupal 5 site with phpBB 2.0.21. We are using the phpbb module to bridge the user accounts and login. We are preparing to roll out a Drupal 6 upgrade next week. There doesn't seem to be any phpbb module version for Drupal 6. We need to have a plan to deal with this and wanted to see if anyone has reccomendations on how to solve this.

We can upgrade phpBB to the latest version 3, but is there any (even devel level) support for a Drupal 6 -> phpBB3 module?

Any help/suggestions would be appreciated.