"custom GUI assets like buttons, text boxes, textures and other elements"
Would an imagebutton that looks like an item within the story be considered outside this realm? For example, the player has the choice between a cup of tea or a cookie and you get to click on them to choose. If so, I would just make it a text option.
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Hello! Thanks for your question.
These buttons should only appear as a choice, and the images should not appear again in other parts of the game. Our main concern is that this can be abused to bypass the item/arm/head change limit.
I understand that this would make the game look a little more different, but on a personal account I’d go with text choices, and spend the time you would’ve used in drawing those images into adding extra detail to the sprite and background or the CG.