So I may have finally figured out a method to get the payouts to work properly. Since I am decisively indecisive, it is time for the polling.

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Option 1: Original Layout

When cashing in with the NPC, it will remain on the NPC chat frame for the entire duration. The completion dialogue will display alongside a new "victory" screen popup. This new popup will look and act the same as the one featured in battle, albeit accounting for powerups and items. It will also give a bit better context as to when the player can exit.

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Option 2: Transfer to Battle

When cashing in with the NPC, it will start on the NPC chat frame and later move over to the battle frame. The completion dialogue will display alongside a new button. Pressing this button will send the player to battle against a low health "enemy" what will award the goods upon defeat.