Using "press this" as a way to reshare a post

Is there a way to add a “reshare” link next to each post that grabs it’s permalink and gives it to wp-admin/press-this.php?

If not, then I will attempt to add a static link to the post box that simply opens “press-this.php” in a new window. I’m sure the correct way to do this is with a child theme. Do I just copy post-form.php into the child theme and edit it there? What if P2 updates and changes the original post-form.php file?