Simple enough, activate Lagoon from the start and use Taliyah as early item holder for Kai'Sa if you don't find her. Level up to 4 at stage 2-1.
Stay at Level 6 and start your slowroll strategy. Having Volibear will activate Shimmerscale and Dragonmancer (DM). Make Kai'Sa the DM hero and give the Shimmerscale item to either Jax or Zac. Level up to 6 at stage 3-2.