MMEX-scam will find that a new application is required - there is no process to amend a PBR grant, other than a petition to TCEQ, which has no guarantee of being granted.
MMEX-scam would almost certainly find that new PBR application to fail - the most likely reason critical process components were "forgotten" in the first place is that they'd bust the PBR limits.
Addition of the process equipment, including a desalter, steam unit, pre-flash, pump-around, and parallel/redundant heat exchange, to name a few "missing" pieces would cause the proposed system to exceed the PBR emissions thresholds, requiring full NSR.