Hello,
You need to put more details about what your requierements to get an accurate answer. I unserstand you want to manage these two gateways completely independent. In this case you need to disable secondary connect and mep on both gateways, in this way you will be able to have as many gateways as you want on the community and will be able to configure encryption domains independently.
Solved: Disabling MEP - Check Point CheckMates
Remote Access Clients for Windows 32/64-bit E80.72 and Higher Administration Guide (checkpoint.com)
On remote access clients guide look for secondary connect configuration section, and change client decide and default options to False.
Regards