D’OH! I can't believe I forgot about this. You can setup an extension in the remote switch to perform the FAC! If you dial into the remote system and do a CHA REM, you can setup an extension that can be dialed out from the outside, give it a barrier code (essentially a password; AND SET IT TO 7 DIGITIS!) Give it a COS with console permissions, whatever COR your stations there use and you should be able to use the FAC in that switch to disable call forwarding on any extension. BUT, I highly, highly recommend removing the remote extension when you are done. That’s a wide open door for toll fraud.
And that's a good question. All of my switches are connected via T1's, but I have never really asked what it would take to connect two switches on a smaller, less expensive scale. Now, I know that you have had to purchase the type of switch that can be 'networked' and that does not mean in a data sense, but rather switch-to-switch. I would definitely check with your AE to make sure that your systems have the capability. If so, your AE will probably refer you to a Design Specialist to discuss your options.