OK, you don't need to forward lookup zone, the ones you already have created by SBS will be sufficient.
As this is an external issue you need to create an A record in your EXTERNAL DNS service to point the A record remote.triton-ind.com to your routers public IP address.
I would also recommend a commercial SSL certificate in the form of a UCC/SAN certificate (
http://www.godaddy.com/) with 5 domains in it.
remote.triton-ind.com
owa.triton-ind.com (your OWA URL, can be the remote one if you wish)
autodiscover.triton-ind.co
m
MAINSERVER.triton.local (the internal Fully Qualified Domain Name of your server.
MAINSERVER (NETBIOS name of your server)
There is a certificate wizard in the SBS console that will help you do this.