Not sure if these builds are going to be any different with your RX460, but once you've booted into 7.90.005 (xorg error or not) you should be able to use ssh or samba to copy in one of these test builds and reboot.
Texture Cache Maintenance Utility: Preload your texture cache for optimal UI performance. Remotely manage media libraries. Purge unused artwork to free up space. Find missing media. Configurable QA check to highlight metadata issues. Aid in diagnosis of library and cache related problems.
