It seems the pGina project has been resurrected some time ago.
With my limited testing it seems as this works together with OPSI, if you set one pGina option correctly: Gina options -> Chained Gina.
Use the path to the opsigina.dll file, the one probably in this location: %ProgramFiles32Dir%\opsi.org\opsi-client-agent\opsigina\opsigina.dll
The big problem with pGina - it needs the .net lamework
