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I don't have an answer that fits your constraints (i.e. not modifying source code) but when I've used ira_laser_tools in the past, the only way to have it work deterministically 100% as expected is to fix the issues it has with timing. Otherwise, unexpected things can alter the stock ira_laser_tools behavior, such as rearranging or adding to a launch file.

You can perhaps look into using a fork that already implements timing fixes: see this Pull Request. I have used this fork in the past and it worked well for me. This will save you time and get you back to it working again without having to edit files yourself.