Create an additional email template for recruiting campaigns

Summary

is it possible to create an additional custom template that can be chosen besides the Blank/Basic/Multi-Column option in Recruiting Campaigns?

Content

Hi all, 

When recruiters design the email content for a Recruiting Campaign, they can choose among a Blank, Basic or Multi-Column template, and then customize the email itself. Since they are accustomed to using a kind of standard form for emails with the company logo, the signature, etc etc, we'd like to know if it is possible to add an additional custom template (besides the Blank/Basic/Multi-Column options) in order for them to start creating the campaign email not from scratch, but relying on a template that already meets their basic requirements in terms of branding.