Just redirect the gameports to your computer. If you wanna make it frequently reachable WAN sides I recommend to - at least you should - rent a dyndns servicename.
I hope this isnt a advertisement:
Quote:

Create up to 30 unique hostnames
Rapid propagation with low TTLs
Hundreds of premium domains
Stellar in-house email support
Permanent device connectivity
--> 30 unique hostnames means 30 different ports are useable (example: GW 15779, Agent 15884 etc)
--> 30$ per year that means 2.5$ per Month!
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you have to enter the dyndns name into your router.
should work with all common devices which are not older than ~4 years.