So if I understand you correctly we need to send a wide array of both spec macros to the client at the time of the export? Why? This seems wasteful and inefficient. This means a warrior that has to do both Arms and Prot needs macros for both at the time of the export instead of just one.

Would it not be better to have the option of triggering an export via the isboxer menu in game?

I guess the better option then is to put the macros in WoW itself and have isboxer only press keys? I don't particularly like this approach as moving characters around, renaming them etc causes a lot of headaches with the stored macros on that side.