Before I would even consider focusing on sprints I would at least train so that I could sit in with the pack. You might even turn out to be a decent sprinter anyway. I know some riders that get crushed 1 vs. 1 in training sessions, but always finishes top 5 in sprint finishes because of high threshold and/or anaerobic capabilities in addition to tactical savvy. They do well simply because they are the most rested when the sprint begins.