Sale (closing date) and EC inventory control for Node Products?

I'm using the Node Product module to create custom content types that appear as cartable products. I'm also using EC inventory to control inventory and Sale (closing date) to set expiration dates for products. Node Product seems completely incapable of displaying EC inventory and Sale (closing date) controls. Is there any way to create a node product that uses the controls offered by the EC inventory and Sale (closing date) module? Currently inventory controls and sale closing controls appear only on the "official" product types, such as "Non-Shippable Product" and "Tangible Product."

How can I get Sale (closing date) and EC inventory controls to show up on custom content types that are "products" via Node Product? Is this clear?

Thanks!