Exclude specific tasks from Project Percent Complete

Hi - has anyone identified a creative workaround for excluding tasks from the project's percent complete that displays at the top of the screen?

The tasks we need to exclude must have planned work and planned duration (b/c they relate to how we assign staffing at the project level), and they cause the calculation to be off all the time. I'm hoping for a setting or option like "exclude tasks with these attributes" from calculation before I go exploring a Fusion job that would recalculate the % complete for the offending tasks on a scheduled basis.

Thanks for the suggestions!