OK,
I have found the answer myself. There is a theoretical possibility by creating a virtual-router. The problem is, you can't move fxp0 to this as it has to reside in inet.0. So you could move your other interfaces to the new virtual-router. Problem with this is when you are using VPN.... VPN has to be terminated at inet.0.
The solution for will be a seperate management server, that is directly connected to the srx boxes. At least I will have a direct serial console to one of the srx.