You can chain multiple tunnel commands into one SSH command. I think that's what you're asking, anyway.

I do:

autossh -f -M 6969 -L 2222:host1:22 -D 8000 host2 -N

That gives me an SSH relay to host1 via host2 and an SSH SOCKS proxy via host2. Autossh will re-start the tunnel to host2 if it goes down.

Also, check out openvpn.

All that said, you probably signed something that says they can fire you if you circumvent their network access controls, and they probably watch what you SSH to (the connection in encrypted, but they can still see where your endpoint is), so don't do anything silly.

If its the NSA, I wouldn't be surprised if they could decrypt the SSH data in near-real time. Of course, the amount of processing power they'd dedicate to it would probably ensure we never heard from nsajeff again... That could be processor time we're using to listen to terrorists.