WayneWhy build a bridge?
As mentioned earlier the only ability I really need from your plug-in to monetize it is the ability to change and/or lock listing status (Public/Private/Unlisted) based on user type just like how you can allow/disallow editing/publishing based on user type.
Then from there I can control the listings with a third party plug-in of my choosing or manually control it.
Toll bridge
I noticed that you have chosen a plug-in to integrate (be compatible with) ‘Restrict Content Pro’ which is a paid plug-in. Not that I don’t like supporting programmers, however I would like the freedom to choose what plug-in I use and pay for. My solution above would leave the option open to the users of your plug-in. Then after that if you wish to introduce better compatibility with third party plug-ins of your choosing then go for it.