One thing is name and desing style similarities, but another is to be an exact clone of previous incarnations.
Geomancer could perfectly become a healer in this game thanks to the CNJ lore but it will need a main class so CNJ stays as lvl 15 and he doesnt branch into 2 healers from level 30.

The whole Elemental lore serves for Geomancer just perfect, cause their Geomancy is also called Elemental. This is our chance to also get a class which plays a mayor role with elemental atributes, like "X element buffs" and "X element resistance" as well as healing.

Oh, and remember, Geomancer is a killing melee machine in FFT xD