Default [Q] Wireless Hotspot not working on unlocked i747 running KitKat UCUFNE4

I just updated to stock 4.4.2 Kitkat on my i747 (and then rerooted). However, since I'm using the phone on T-Mobile network, I get an "Mobile data not available or invalid sim" error when I switch on Hotspot.

I know in past firmware, the were mods that changed or removed the Tetheringprovision.apk but those threads warn not to use such mods in any other firmware except Jelly Bean.

Does anyone have a workaround to get Hotspot working on 4.4.2 yet?