Although seeking out masters to learn new combat techniques is archetypal for warrior-types, we are talking here about the acquisition of non-combat powers outside of the level-up mechanic. I am not sure what non-combat powers of this manner would really fit the fighter... unless:
Imagine that rituals could be learned through skills and used by anybody with the appropriate skill. Arcane rituals would require an arcana skill check to learn and to perform (both would be trained only), while religious rituals would require a religion skill check to learn and to perform. Hence, even classes such as fighters could learn arcane rituals if they really wanted to, but it would cost them (using SWSE skill rules: one feat to make arcana their class skill and another to become trained in it). Some of the more advanced rituals could require skill focus in the relevant skill or even higher higher specialisations, such skill mastery and more if they exist in the game.
Imagine that rituals could be learned through skills and used by anybody with the appropriate skill. Arcane rituals would require an arcana skill check to learn and to perform (both would be trained only), while religious rituals would require a religion skill check to learn and to perform. Hence, even classes such as fighters could learn arcane rituals if they really wanted to, but it would cost them (using SWSE skill rules: one feat to make arcana their class skill and another to become trained in it). Some of the more advanced rituals could require skill focus in the relevant skill or even higher higher specialisations, such skill mastery and more if they exist in the game.