Simple - purchasable health pots. Heal more for less money than healing rite, but they're finite resource, and once used, they're gone. Will help survive when laning against a direct counter to your hero.
I like the idea of health potions, however it will probably need some sort of adjusting for heros since some are obviously built for laning and some are build more for roaming killing ganking etc. Like bebop for example has a terrible laning but really excels at killing .