I think Geomancer could work as a DPS. Not sure if they should have 2 handed hammers or a 1 handed hammer but since they revealed that character for Eden I think it should have hammers.
I think Chemist could work as a Healer. Not sure how it would play. Maybe have a mix ability like ninja's mudras but... you kinda need to be fast when healing and that could slow you down.

I never want to see another limited job for as long as I live.