Create a custom metadata type and associate the LastModifiedBy field. Write a flow that updates the field in any flows or processes equal to the consultant's name.

Request an Email Log from Email Log Files in Setup and filter the request by the consultant's email. Manually update any flows or processes listed on the log.

Set Send Process or Flow Error Email' to Apex Exception Email Recipients' in Automation settings. Add the System Admin's email to the Apex Exception Email page in Setup.

Export Flow Interviews filtered by LastModifiedBy.email using Data Loader. In the .csv file, change LastModifiedBy to the System Admin and upload changes with Data Loader.