Extra (custom) fields in user registration

Currently I´m running Pie Register plugin to enable frontend registering, login and profile editing. I´ve added some custom user fields (company, department, phone), which are displayed at registration form and in profile.

Now I want to enhance my site with Coursepress Pro and I´ve read that both plugins´ register/login processes don´t integrate with each other. It would be ok for me to remove Pie Register, but I need those additional user fields. How ca I add those fields to Coursepress´ register form and profile page?