Can I use 3rd party PHP captcha?

Hi, Since anytime I try to use CSS Formbuilder either on a form I have already created, in a div I have defined, or on a new page with other containers, it trashes the entire layout, I am wondering if I can use it for validating a form along with Universal Email and then add a third-party captcha field. Will doing that ruin either the validation or the inner working of UE4? There are a number of third-party PHP captchas that just require adding a few code lines but I don't want to choke UE4's PHP or Formbuilder's validation.

Anyone have experience with this?

As an aside, I would be happy to detail the features that would make Formbuilder a truly useful product instead of what it currently is—apparently a work-in-progress that causes more work fixing it's damage than simply hand-coding a form. But the validation does work as long as you use a table-based form to start with and UE4 to process that form.