https://github.com/jarnedemeulemeester/findroid
This is the repository? They have a ko-fi link in the repository meaning they accept donations to support the development. Have you tried contacting the lead developer of the project and asking if they would be interested in adding the feature you want if you sponsored it via a donation?
I would imagine the flight recorders keep recording as long as there’s any power left in the aircraft. So if there was a bird strike as they suspect, and if that caused a dual engine failure, the recorders should still work, right? So there has to be more to the story than a simple bird strike.