Access to IFC Export Configurations

We have an issue where we programmatically want to select a custom export config saved in a Revit file. It does not work as intended because the enumerator only contains the standard configs after opening the Revit file, UNTIL you actually open the IFC Export dialog box in Revit. Then afterwards it is accessible . This is a hindrance for mass exporting IFC files through Dynamo/Python/Revit Batch processor etc.
Bug?
I've used the AddSavedConfigurations() method, but it doesn't seem to work until I've actually opened the Export UI.

Start by reproducing the saved-configuration lookup after opening a Revit file, comparing the enumerator before and after opening the IFC Export dialog. Investigate the AddSavedConfigurations() path and define done as making custom saved configurations available programmatically without opening the export UI.

Written by the indexing model from the issue text.