I am restructuring an org I recently took over. Need to reduce case records types from 10 down to 2. The blocker from changing record types is that they are referenced in a lightning record page (see image). There are over 5000 assignments to this case record page.
I have attempted VS Code with SF CLI and also Workbench to mass remove these assignments without success. Are there any other methods to remove these assignments so I can delete this record page? If not, I was close with Workbench but could not structure the ZIP file properly to deploy.

CustomApplicationmetadata type; specifically inProfileActionOverridesxml tag. Presumably you don't have 5000 custom apps so use a text editor in VsCode to delete theProfileActionOverridesblock for the relevant recordtype in the relevant CustomApps