Hi,
My name is Budhi Hamdani and I am professional system and network administrator. Regarding with your task to do port forwarding I coud do it in a couple of hours. I had experience to do such job with high end devices like fortigate 1500D or Sonicwall 6600 series to low end router such as TP Link. I am also had experiences using linux or *bsd server to such job.
I wil do the job and create documentation for you so next time you need to add another port/application you can do it by yourself.
Best Regards,
Budhi Hamdani