SCVMM NVGRE Gateway inbound

I am able to gain external access through the F5 Big IP using it as a multi-tenant NVGRE gateway using SCVMM 2012 R2.

My question is how do I access the VM's externally? Do I create a Virtual server and NAT each connection or is there a better way? The Microsoft HNV Gateway provides a simple interface or powershell for creating NAT connections, is there something similar for F5?