I'm wondering if it is possible to swap characters in set or change it a different set on the fly without having to shutdown the instance of WOW that character is running in?

I tried swapping in a new char, saved and exported, then relaunched the character set. But unless I close WOW and let ISboxer reopen it, when I load in the new char, I still get the message saying ISboxer was expecting the character that I swapped out.