Make a buy now button using generateblocks button

Hey guys,

Is it at all possible to make the genwrateblocks button act as a buy now button?

I'm trying to figure out a way to add these custom buttons to a landing page without using a plugin. I understand the process of linking to the checkout page thru that button but can't quite figure out the best way to have a specific item added to cart with the same click.

Is there a simple hook or other type of element I could create for this button?