It is definetly doable and worth a shot. One plan would be:

Make your druid the main, paly and rogue as alts. When going in to attack with the druid, just stealth your rogue and put him on autofollow. Using your druid, attack the mob and continue moving forward until the mob turns around, then stop. if done correctly, your rogue should still be stealthed and the mob should have his back to him. This will allow you to use the Rogues openers and main dps attacks. You will most likely need seperate keybindings for each class (as in pressing 1 on your main only does something on your main). Healing is easily macroed and should not be an issue.