Please do not lock Jobs to the Weapon Class that unlocks them.

[Chinook]

Divine Lancer
Class: Lancer
Weapon: Lance
Job: White Mage
Job Trait: +25% Healing Potency (Tier 1)
Job Ability: Benediction

This is how it could look. Again, this character would probably suck, but I wouldn't go so far as to say such a character should be impossible to make.

We can already do something pretty similar by equipping One with Nature trait, Fastcast trait, Cure III, Protect II, Shell II, Stoneskin II, Shock Spikes II, Poisona, Blindna, Dia, etc ...) on a Lancer.

So .. if I use FFXI as an example since some of you like it very much, you want a system that allows LNC75/WHM75 (the current cross-class skills could be compared to the level 1-37 abilities, and the job might provide the level 38-75 abilities) with access to 2hour abilities and weapons?