This task can be performed using BulkSignature
BulkSignature is a powerful email signature management solution for businesses of different size
Best product for this task

BulkSignature
marketing
BulkSignature is an advanced email signature management solution for Google Workspace. It enables business to automate signature deployment, ensure brand consistency, and simplify updates with a user-friendly HTML editor, bulk user management, and campaign banners. Designed for IT teams and businesses, BulkSignature reduces manual work, enhances corporate communication, and provides seamless integration for effortless signature management across the entire organization.

What to expect from an ideal product
- Set up a single master signature template and push it to all employees at once through the Google Workspace connection
- Update company logos, contact details, and branding elements across all signatures with just a few clicks
- Ensure every team member uses the right fonts, colors, and formatting with locked signature settings
- Add and remove marketing banners for seasonal campaigns without asking employees to change their signatures
- Manage different signature versions for departments or regions while keeping core brand elements intact