Weight Recording module

Hi, late but after enabling FIT recording in CIQ 1.3 i was about to rethink an app for my BC-1000.
My Tanita App is ready for displaying weight on my FR920XT.
But what is the best way to record the data to a fit file, since there is no support for FIT File Type "Weight"?
Using FIT development fields is an option but there is no equivalence for a "native_field_num" in the session/record messages.
So my last option is to create a session (for which activity?) with one record containing weight data.

My proposal is for a Module: Toybox::WeightRecording :D