What's the point of being expedited as GE into what is likely to be a more even poorly provisioned CBP Preclearance area than is the case for the pre-CBP Preclearance section of an airport? And even if wanting to get cleared into CBP Preclearance earlier at an airport or with less of a line in parts, there may still be the cut-off time issue to clear CBP or otherwise be turned back to the airline to get rebooked. And at a CBP Preclearance facility, how few CBP employees have to get sick before GE at the PreClearance becomes an even more extraordinary hassle?

Belgium isn't the UAE or even Canada or even Ireland; and BRU won't be able to do for BRU CBP Preclearance what the oil-rich UAE is willing to do to have CBP Preclearance in the UAE.