I tried triggering port 22 and forwarding 443 under port trigger

NE- You are doing it the wrong way.. You need to setup port 443 to forward to port 22.

Meaning that external to your network you connect to your router ip at port 443.

The router will then forward that traffic to your internal system ip(192.168.x.x) at port 22.

It is still pretty easy for an experienced person, or a good scanning tool to detect that port 443 is open. If you are outputting sometype of banner you can easily tell that somebody has just changed the SSL port..

it should stop auto scanners though.

I'm not sure about that specific firmware, but you usually have to enable anonymous WAN requests on linksys routers to get port forwarding to work.