It's doable but rather not.
Twenty Twelve use
id="secondary" for both sidebar and sidebar-front, this means if we add the call to sidebar on
front-page.php there will be duplicate
id on one page.
You can, however, make another copy of
sidebar.php and rename it to something else like
sidebar-main.php and inside it change
id="sidebar-main". Then in your child theme, make a copy of
front-page.php with a call to this sidebar we've just made above the
get_sidebar('front'). Also, there will be quit a bit of CSS adjustments to do.