Create a PDF map from an existing ArcGIS Pro Layout using FME Desktop or Server.

You'll need to embed some ArcPy Python in your workbench. Here is an example of how to use ArcPy in FME:

https://community.safe.com/s/article/using-arcpy-for-fme-feature-processing

And example of the script to export a layout to pdf is here:

https://gis.stackexchange.com/questions/316471/exporting-to-pdf-using-arcpy-of-arcgis-pro

and there is some more documentation here:

https://pro.arcgis.com/en/pro-app/latest/help/sharing/overview/pdf-export.htm

Thanks for the quick reply @hkingsbury​ I will let you know how I go.