A quick and dirty approach could be as simple as defining a global var with the name of the target site.
Meaning you would still have to export 3 times, but only change one variable for each export.
On the events where you use the needed sdk, simply add a subevent checking for the global variable.
Add a check for this variable where applicable to determine which to use.
There is also a method to check the URL of a website through the browser object, through this you could determine what the global variable should be and have the process automated.