Hi,
I’m sorry, I’m doing the most I can. I’m already overdoing my support duties, as configuration, and finding out details about specific installation is not actually part of it. I’m doing my best to help, but I am not the author of the other plugin, and I am not familiar with it’s inner workings, all I can do is share what I find.
This definitely needs some sort of a customization to somehow connect the product post type with the other one, or use their plugin API. Unfortunately I am not available for customizations, I can barely handle my current duties at the moment. I can suggest trying wpkraken or envato studio to find devs.