If anybody is having trouble flashing the System Updates/OTAs, here are the two modified update zips that have the getprop lines removed from the updater-script.
Finally got it to flash!
Did the following to make it work:
1. Restored to factory settings using RootJunky's Super Root Tool
2. Flashed TWRP 22.214.171.124 (only one that I could get sideloading to work with)
3. Flashed the OTA from 48R -> 01S and...
In case anybody had the same problem as me after wiping and installing (internal storage inaccessible):
adb shell su restorecon –v -r /data/media
Other than that, I was able to restore all of my system data along with apps and data via Titan...
For anyone having trouble getting USB MTP (or any other protocol) to work, the USB Settings have moved to the Developer Options. Tap the Build Number in About Phone a few times to get to them
This app seems like it does what you're describing: