Convert back into osm.pbf

[jkbennemann]

I'd like to process a .pdf file and enhance it with the curvature stats but rather bring it back to an .osm.pbf format, ideally where the curvature value is added as a tag inside a way.

Is there any way to convert the output back into a osm.pbf file instead of the kml file?
Does anybody know how I would add the curvature value as a way tag?

Thanks for any help in advance