Thank you for trying to find a usable work-around, while HubSpot tries to build the feature.
However, it’s not a viable work-around for when our clients are replying to the multiples of contact owners we have on our outgoing email campaigns. Their specific questions in their reply would be routed to one inbox and not get to the contact’s owner. Creating a workflow to notify the contact owner to call disregards our valued client taking the time to type a thoughtful communication in their reply.
Also, the analytics on these replies would be a separate report to run. Not very efficient.
Keep going, HubSpot.