Multiple P2P Circuits on one Providers Switch

[miller...@gmail.com]

Looking for a recommendation on how others would model this.   We have a large number of point to point connections that are delivered by multiple vendors.  Rather than them installing a piece of equipment for each of the p2p links they have put in larger equipment (Such as Cisco ASR920's, or Ciena 5160's)  They then configure a port to be the handoff for that specific circuit which we then tie into a switch on our end and tag it to a VLAN.   

I want to be able to model the Circuit in the circuits portion of netbox and also model the vendors device and our device and show the cross connect of cables between the two devices so I can correlate a port on our device directly to a circuit.  

If I build the vendors device as a standard device with interfaces I can't tag both my switch port and the vendors circuit to the device.     

So the two options that seem to come to mind for me are either building a special version of the device to be more like a patch panel (with a Front and Rear port where Front is my device and Rear is the vendors circuit), or I build it and create some type of Virtual port with the same port number as the physical port and link the physical to my switch and the virtual to the Vendor's circuit. 

Any advice on how to model this best?  Or is it really just pick one and run with it?