Per multiple requests, here is the set of scripts I wrote that use the MS Texconv utility to convert textures to BC7. Please make backups of your textures before using this. Please know that converting a texture to BC7 may lead to unexpected results.

This contains a batch script that I wrote that converts dds files to work on the Xbox 1. It includes everything needed. Just extract these to the root of your textures, then run the batch file.