export/save function for final eligible area

[jome1]

I hope I have not overseen such a function.
It would be nice to have an easy function which exports/saves the final eligible area when having added all exclusions, whereby non-eligible pixels are automatically set to "no data". This geotiff file should then be easily importable to e.g. QGIS.
Or are you using rasterio for this to save the boolean array from shape_availability?