IPFW Port forwarding through VPN

I have Openvpn running in one of my jails that contains a torrent client. My vpn provider offers port forwarding and I have it enabled. They provide me a port to use (UDP 49154). I have my torrent client set up to use that port. Despite this I still do not have an open port. The torrent client still functions and can still connect, but I am not discoverable so I rely on finding peers with open ports to make the connection.

I have IPFW set up as a killswitch so torrent traffic can only be routed through the TUN interface created by openvpn.

I understand I probably require some type of NAT set up to actually open the port between this jail, and the vpn.

Jail IP: 10.0.1.104
Desired port to open: UDP 49154
Tun Interface: tun9

NAT is not something I've had success figuring out. Can anyone provide me some assistance with this?
 
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