How to remove a TF from a ROS bag?

I have a bag that contains a large TF tree where one TF (base_link->virtual_cam) was calculated based on several TFs and parameters. I would like to replay this bag without this generated TF in order to interactively re-generate it as a play the bag. Hence the question, how do I remove this TF from the bag? Alternatively, can I play the bag without outputting this TF? Specs: Ubuntu 12.04, Fuerte