Again, I don’t want to try to program a filter hook. Some themes don’t provide a functions.php file to put in a custom function like the one my site uses. I’m asking for a feature to have a place in the plugin on the back end to simply enter a URL for the post action so it applies to that form only. Putting in a hook as you describe will make all forms post to the same place which I don’t want. For example, I want one form to post normally, and I want another form to post to a Salesforce/Pardot form handler, but I can’t do that unless there’s a way to tell only the one form to post to the form handler URL.
This may take me a while. I don’t have direct access to any older devices of my own. Stay tuned.