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I'm not sure that I completely understand your use case. But here's something that might be useful: you can selectively filter messages from a .bag. E.g., to get all the non-tf messages, plus only those tf messages that encode a particular transform:

rosbag filter in.bag out.bag 'topic != "tf" or m.transforms[0].header.frame_id == "odom_combined" and m.transforms[0].child_frame_id == "base_footprint"'

I often do something like this to remove the map->odom transform from a bag so that I can test amcl or gmapping.