As a seasoned full-stack developer with over 14 years of experience, my depth of knowledge spans across various platforms and technologies, including PHP/MySQL, HTML, and database programming, which are all the ingredients necessary for your Xenforo project. In fact, I've dealt with registration data handling and replicating it into separate databases before in similar projects. This puts me in an excellent position to effectively deliver on your requirements.
Furthermore, my proficiency in notable frameworks like Laravel and CodeIgniter allows me to navigate complex systems such as Xenforo with relative ease. I can ensure the swift integration of the add-on into your forum without needing your Xenforo license key - a proof of my commitment to professionalism and client satisfaction.
In terms of cybersecurity, I fully understand the significance of protecting sensitive user data like passwords. My deep-rooted understanding of hashing and salting techniques used by other platforms similar to MyBB will guarantee that your users' passwords will be safely replicated into the additional database. With every step I take in this project, you'll receive a coherent demonstration of my unwavering dedication to quality work framed within strict data protection protocols. Let's get this done right!