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Maybe I misunderstood, what you want to do, but I don't really see a way out of your problem. As long as your pull request isn't processed, there is not other way than actually using a custom version wherever you need it.

For your specific problem there is a solution though. If you only want to play a bag file for a certain time, you can create a new bag file that only contains data up to that time. A standard rosbag play would then do the right thing. rosbag filter is what you are looking for.