I assume you're being ironic because we all have exactly the same amount of space, and yet I, being your equal as far as space is concerned, am requesting this change knowing full-well the burdens of situational gear. Try BRD with no Gjallarhorn.
Fie on your inventory woes. We all have them, and unless FFXI ditches console support, we always will have them. Take your pick:
1. Every situation requires exactly the same strategy, but you only need one set of gear to optimize the strategy.
2. Every situation is unique and it is impossible to have the ideal gear for all those situations.
I pick #2.