Thanks for writing in! We at Theme.co we always follow the WordPress standards. Having said that, all the settings of the X theme relies only of the customizer. Redux Framework is an option framework and it maybe possible to work with X with several modifications. Please bear in mind that custom development is beyond the scope of our support. Before deciding anything, I would recommend that you review and understand first the difference of the Redux Framework and the customizer. Please check out this video from Redux: