Hi there again,
We have recently merged an improvement for our SimBrief integration. It is now possible to configure separate passenger and luggage weights.
For more details on the new feature see the documentation:
https://docs.flybywiresim.com/fbw-a32nx/feature-guides/loading-fuel-weight/#changing-default-weights-using-simbrief
For this to work you need to update the SimBrief airframe to the one we are providing here:
https://docs.flybywiresim.com/fbw-a32nx/installation/#simbrief-airframe