Creating a bundle is an interesting approach to this.
User supplied price products are purposefully ignored by the promotions engine logic. This is because the original use case for USP products is for donations. There's no reason to apply a promotion to donation-style products.
Another way to do this is to use the action delegate pipeline integration to add a product to the cart that represents the percentage markup you're looking for. This could also be a USP product, and you'd want to hide it from the categories.
Will Strohl, Upendo Ventures
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