Speed up the update release process
The update should be available for every GSuite account around mid-March.
Therefore, your domain admin can speed up this release process to get Google features faster. Visit this article to learn how.
Use a Gmail account and set your GSuite account as alias
Pending the Google update, you can configure your campaign from a Gmail account and use your Google Workspace account as an alias.
Doing this, your recipients will receive your emails from your Google Workspace account. You can visit this article to learn how to configure an alias with Mergo.