Dual Access to Mapped Domain and Subsite Url

I was wondering if it would be possible in the SuperAdmin setting for domain mapping to incorporate a function to allow the front end of a subsite to be accessed from both the mapped domain and subsite address.

For example, (when mapping subsite.com to subsite.wpmultisite.com) just as a user can access the admin panel from subsite.wpmultisite.com AND subsite.com, it would be great to have the option to be able to access the site from both domains.

This would allow for situations where the plugin user could order a wildcard SSL cert for all subsites and not have the added cost of purchasing a multi-domain SSL for each additional mapped domain. Among other benefits.