Is there a way I can sell variations to customers through the same license?

I would be willing to do custom variations for sounds without much cost or hassle for a customer, but the main reason I don’t want to is because I’d either have to wait over a week for an sfx to be approved which means the customer will have lost interest, or, I would have to sell it via email without any protected license. Is there a way I can fix this on Envato?