Thinking about it more, a healing rotation could work if we use MNK as a framework. A ST heal rotation and an AoE heal rotation that you could swap between at will depending on the situation at hand. But such a rotation would be basically nothing unless they add interesting effects to each spell in the combo.

So like:
1 > 2 > 3 for the ST rotation
4 > 5 > 6 for the AoE rotation

Then you can go 1 > 5 > 3 if you need an AoE heal in between the ST heals. Could be interesting, but could also end up being very bad if not done properly.