How do I add a separate one of charge when customising a product, no matter the quantity?

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So this is an embroidery business, but to set up a new logo there is a one off £25 charge that needs to be separate rather than built into the item cost. So it can't be added as a variant, because if someone orders 10, the £25 fee would be built in and charged 10 times. 


I have set up customisation choices using the variant option app but it doesn't allow to charge a cost as far as I can see. 


I need to set it up exactly how it's set up on this website: 





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