You may be in luck but not on JVZoo. There is a new affiliate/vendor network that pays instantly called DUvisio.com. DUvisio is now adding a way for their Enterprise members to mark their products in the Public Market Place that will let other vendors know they are interested in an Integration type Joint Venture. This means they are willing to have their product used as your trigger, upsell or downsell product.
You can try to do the joint venture yourself or you will be assigned a joint venture broker that can create the joint venture for you.
It is called Instajv Funnel and will probably be available in a week of this post. Again it is only available for the Enterprise Membership Level.
Like I said in my first answer to your post, this should be a joint venture. DUvisio.com is the only Affiliate/Vendor network that is willing to help you make more money using joint ventures.