I see, that is difficult. If I understand you can type the data in to the app or you can get this plug-in that works with the Kestrel. I only see three possibilities to automate it.
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Write your own plugin. Somebody wrote the Kestrel plugin. Can they write (or give you enough info to write) a generic plugin that will work with an Arduino?
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Make the Arduino look like a bluetooth keyboard to enter the data in text.
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Hack / Crack the Kestrel interface and make the Arduino interface the same. Unfortunately this requires having a Kestrel and some bluetooth tools. Maybe someone will crack it.