How to bind the registration form in the response collection form and receive all the data by mail?

Question

Joomla

Friends, there is a site for a furniture company https://voronmebel.ru, which runs on joomla 3.
On this site, I came up with a quiz calculator that polls the user and sends answers to the mail. Everything comes through a typical php handler. Everything works great, but there is a problem. How to make it so that even the user on the site is automatically registered.
I thought about inserting a standard registration form module into the last window with questions, but I can't insert the module into the module, and I can't hook all the other quiz answers to the registration form.
If not difficult, look and help me. And then you have to work with the audience that filled out the quiz through unisender, but almost all letters do not pass spam defense. And yes, it would be better.
Maybe there is an option to take the data and somehow tell the site that they should form a new user in the admin panel.

Answer 1

fit?