I would suggest shutting it down, keeping the humidity at 40-50%, and turning it on when you get back, print a couple of pages then try a nozzle check and clean.
Bottom line, you will most likely have some clogs, even if you run the software. While that may help, it probably isn't enough to prevent all clogs. Even a 7600 that is used daily has little chance of not getting some clogs in that period of time, meaning you are going to have to clean the machine anyway. Since you can't clean channels, but just the whole head, I seriously doubt anything you do with that particular printer will make things any better than just shutting it down other than humidity control.