pfSense

Outbound NAT might be feasible but for port forwards this could be problematic as the group rules wouldn't get reply-to so the end result wouldn't be what the user expects.

You would have to split the user rule(s) with respective reply-to.

On 2.4.4.a.20180810.1552, was able to create an Interface Group, then a NAT Port Forward using the newly created Interface Group (associated rule was also created on the Interface Group at Firewall > Rules). A Outbound NAT mapping using the Interface Group was also successfully created.