I feel like if you wanted to mix your system and Kuro's, it'd be easier to start off with
your system (jobs are crowns/titles which limit your accessibily to classes/weapons, while also boosting specific skills), and then adding talent specs to each of the specific jobs.
For example: your Paladin crown could be specialized into offense or defense. Speccing into defense would make your paladin more proficient with defense-related skills, while speccing into offense would make him better with damage related skills.
Odds are the paladin who specced into offense spent most of his time with Lancer, while the one specced into defense would favor Gladiator/Sentinel (see the first picture I linked).
To use another picture as an example, assuming white mages could either spec into healing or buffing, this could be their healing tree in this system too:
picture.
The system becomes a little complex at this point, however... especially if all options have to be balanced. Which is why I didn't really try to push this option back when we had the "job wars".