The GSM Dev Edition and T-Mobile USA are the same phone, XT1053, and use the same ROM. GSM DEV/T-Mobile ROM has no carrier bloat.
You can request the ROM directly from Motorola here -> https://motorola-global-portal.custh...ecovery-images But they only have the VZW 4.4, and GSM Dev 4.4 and 4.2.2. No 4.4.2 images yet.
Oh, and in one of your posts you mentioned about flashing the ATT rom? The ATT X is a XT1058. Its not recommended to flash the rom of one model X (XT1058) onto another model X (XT1053).