Convert mbtiles or .osm.pbf. to kap/BSB charts for OpenCPN

Hi, Completely new to all this, so please excuse my Q.

Just been looking at OpenStreetMap and OpenSeaMap to see if I can use OStreetM data in OpenCPN for inland waterway navigation. Seems that OSeaM uses some OStreetMap data that has been converted to .kap files for use in OpenCPN. I've found OStreetMap files for European countries in formats including .osm.pbf and also Mbtiles from kap.grade.de covering the inland waterways. What I can't work out is how to convert to .kap or BSB to use in OpenCPN?