yeah, that should work, it "should" overwrite what's already there, but i don't have USCC service around here so i have never been able to verify it from someone..... You may have to setup MMS to your servers in the registry, not sure if the provisioning cab does that or not as i have not looked through one in a long time. Also updater app is the newer updated version in this test rom as well. If i'm feeling better tomorrow, i will update all ROMs 21889 Series and 23518 Series. Especially if the 23518 Sense 2.5 proves to be good.
Test ROM in above post for those who don't look backwards
^^^^^^^^^^^^^^^^