Set up Remote Desktop/LogMeIn for each computer individually. Remote into them from second office. LMI also uses HTTPS authentication.
Really, he would only need 1 or possibly 2 computers to remote into, so this is NOT that difficult.
This SHOULD NOT be the main computer, reserve that only for hosting AC.
He could logmein all of his computers but only reserve 1 or 2 for pro. This would allow access if needed. LMI is free for basic.
Ignition makes it VERY quick to log in, but then RDP is quick if you have a static IP address. Both seem quicker than using SBSE remote access.
I'm curious about the other option.