pythonpath in toil outside singularity

I am running split-directions with toil from the command line (outside a singularity). This means that I cannot set python paths before running toil, as workflows using singularities will be reset the python paths to the python paths from the singularity. Due to this, will the vlbi/steps/prep_delay.cwl fail as targetListToCoords will not be found. I currently did a hacky fix by adding sys.path.append("/project/lofarvwf/Software/vlbi/scripts") above the from TargetListToCoords import plugin_main as targetListToCoords but this probably needs a cleaner fix.