That's something I wouldn't know how do to. But, you could achieve something very similar with a workaround.
Install the Advanced Custom Fields plugin (probably my favorite WP plugin, as it allows you to extensively customize the UI for making posts and pages). When creating a new set of custom fields for your posts, you can choose to suppress the native content manager AND title field. In their place, you can create a custom field named "Title", and set it to be a dropdown list of predefined titles.
The catch is that you would have to go into whatever theme you are using, and wherever you the_title(); in any loops, you would have to replace it with the plugin-specific call to that particular piece of metadata.
I've used the solution before, and it works perfectly. Just note that a lot of plugins depend on the the_content(); filter to run. So, if you're thinking of replacing the regular content field, make sure to call that filter in your theme.