So I went ahead and followed this guide to go back to stock 4.4.2
I then went ahead and followed this guide starting from the part that says "Install Pre-Rooted Lollipop on AT&T Galaxy S5"
I went ahead and installed busybox from the playstore and then installed SafeStrap.apk. But now, safestrap doesn't load when I'm booting up the phone so I'm not able to install this rom. Any ideas?