I like what you came up with but you are limiting the character, putting restrictions when as of now there really are none.

Yes the way things are the jobs as a whole seem to have no soul, but then again this is because stats are broken as a whole. For example, you are a THM and supposedly what you should raise is your INT/PIE as a CONJ you should raise your MND/PIE. Now if you where to play your THM and use a CONJ spell the fact that your MND is not that great means the spell you use does not hit as hard as the THM spells. The same can be said for any of the classes depending on what they benefit the most from Stats wise.

Unless stats are going to go away totally then your suggestions are ok, yet you are still limiting yourself, imposing limitations on your character is a bad idea overall. Does it make the character better for some? Probably, but for others all your doing is going back to the Holy Trinity that they wanted to get away from to begin with. But the way they implemented it was bad and it failed miserably. None the less keep the idea's flowing that is the only way that we will see a better game come out of SE's mess.