The basic idea is to have a trinket (or perhaps an upgrade purchased and used for a limited time like the coin booster/weaon slot/trinket slot upgrades) which allows you a loadout swap (either entire loadout or one item) once either per stratum or per tier.

This would give knights willing to put the CE/Crowns into buying or crafting one of these the option to add a little bit of versatility, and would also make journeys where you get into a level and realize that you have equipped the wrong item (or forgotten to equip one at all!) a little bit more forgiving.

For the sake of balance, and to keep it from being easy to abuse in some areas, it would probably be a good idea for such an item to be disabled in boss fight levels, but perhaps an item like this could have some merit for a future update.