I guess somewhere on the JS: VALUE argument of the visustella plugin, you need to insert "user.cparam(Custom Parameter ID Here)", without qoutes. Someone already managed to make thwm work together. And that answe is somewhere on the forums.
https://forums.rpgmakerweb.com/index.php?threads/eli-custom-parameters-add-new-p...
The above is an example. But I know, somewhere on the Visustella thread on the forums, people already talked about that and provided a solution. Maybe you can create a thread asking for it there, and someone will help you out.
But I, don't know how to make this work. I just know that there is a way, and they are compatible.