Is there anywhere that states what a gear set would be tied to? Like is the gear set tied to a weapon change? I know that the drop down on the UI is there but unable to read Japanese. But if it is not tied to a weapon change, then should we start looking at the gear sets from an stat set instead of a job set? Example...
MNK and WAR both use STR as 1 of their 2 stats.
You could set up a gear set for STR by mapping what items you have that gives you such.
Then create another gear set that would fill in the remaining slots with int/vit gear.

This 5 minute thought process probably has holes in it but it could be used so that str gloves, pants, rings x2 are removed from inventory and able to be applied to multiple jobs.