1) I think It WILL certainly work with airports brought from the Marketplace (regardless of being encrypted)
2) As promised, there WILL be free updates to support MSFS 2024 when it is released
3) Set the weights/balances via FMC. GSX will sync when doing boarding/refueling. First call the service and when it is on position and connected and ready, the message will show, prompting you to set the weights.