Hello,
Sounds interesting.
Well, during my long practice, I did get extremely large practical experience with various conversion/porting of VB6 projects (there were very large ones as well) into another programming languages (VC++, VB.NET, C#).
Some of such projects are mentioned in my portfolio (working history page) here, please, you might look on it.
So, I would be happy collaborate and work with you for this particular project.
Honestly speaking, I think there may be probability that you may need conversion to the .NET as well further + there may be further work for supporting of new converted application/project, adding new features etc. You will be welcome as well.
Please, don't hesitate contact me here (via IM) and we could discuss more details.
Best regards
Igor