Outgoing traffic from real servers

why you don't deployed this kind of behaviour :

https://support.f5.com/kb/en-us/products/lc_9_x/manuals/product/lc-implementations-11-6-0/1.html

in this example it is LC but we can very well apply this architecture and internally and with just one GW. Let me now if you need help, i can give you different steps....

I will have done it like that!!!