Not sure why you would want to do something like that but there is almost always a way.
If this is for a single number, I would just select a random “destination” from the drop down, then edit the newly created “inbound route” to create the proper bridge statement for whatever actual destination is desired.
The problem with this method is the call would never make it into your CDR’s since the call would remain in the public context.
An alternative way is to create a “bridge” entry in Applications>Bridges. This will allow for the CDR tracking and gives an easy to select option if needed elsewhere.
in practice most of the time where I have needed to route a DID back out to another external number, I just build a “dummy” extension to make it easier for others to follow what is happening, and to allow calls to follow the rest of dial plan.