Look into the tf2 dedicated server shit, and just run it from your PC. Once you do that you can install sourcemod/ja/whatever plugin you need. People can join while it's running, but if you don't port forward they probably won't be able to.
I did this for a bit with JA to get some engineer footage, but then christmas update hit and I couldn't be assed to update my server. Other people nearby me geographically (Aurora, proto, etc) also managed to get pretty decent pings on it.
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