Do what I do... and what many other self-respecting Scholars do. Macro it to an existing skill.

My Physick spell is macroed to my pets Embrace skill, so I can cure for extra HP on a specific target. Eos and Selene, by default won't heal anyone unless they dip below 80% and their priorities are not always YOUR priority. Secondly, if I'm attacking with Bio and so forth, I've got a macro which means I can keep targeting the tank with heals from my fairies while I'm in otherwise engaged with casting on mobs.

Also my Rouse skill, which boosts heal potency, is also macroed to Eos' Fey Illumination, further boosting heal potency by an extra 20%. See how it works? It's all about tying similar skills together so they work in tandem. Working WITH your pet is a million times better than working as two separate healers, especially give how fairies aren't known for their intelligence.