Mapping virtual detached Interfaces

[AskskwBv8T2nrm4Qnj]

This discussion is a follow-up to this "not planned" feature request: #18050

Somewhat related:
https://groups.google.com/g/netbox-discuss/c/b_onSjcdDbE

In Cloud environments like AWS and OpenStack, it is possible for an Interface to be in a detached state. These are virtual Interfaces that are not 'bound' to any Device or Virtual machine, but an IP may be bound to said Interface even while it is in a detached state. I would like to define these detached virtual Interfaces in NetBox, primarily to keep track of WAN IP-addresses: their existence and (lack of) usage. Ideally there would be something such as a Virtual Switch or even a 'Virtual Device', counterpart to physical Devices, to which to bind these virtual Interfaces.

I would appreciate any suggestions as to how to map these Interfaces accurately, without 'abusing' existing NetBox functionality?
Thanks in advance!