I'm not here to detract from your effort to improve multiboxing, but the way that you describe ISBoxer is inaccurate.
In ISBoxer, you only ever need one Character Set, and you are not required to create X amount of Character Sets (or Window Layouts) for the number of possible combinations of Characters you wish to run together, at any given time. However, additional Character Sets can be created if you're changing what's assigned to it—Key Maps, Virtualization, Click Bars, Menus, etc.—but even then, those non-Character assignments can be adjusted with ISBoxer Actions, and still do not require the creation of a new Character Set.
You and I previously discussed some of this in the ISBoxer Discord when you were coming up with this idea, and I outlined the process of swapping out Characters in the Slots of your Character Set, exporting, performing a /reload in game to refresh the macros, and then playing—all of which should take approximately sixty seconds or less.
I still believe there are going to be deeper underlying issues with this add-on when it comes to custom changes in an ISBoxer profile, as well as more advanced setups, but I'll save them for another time, so as to not drown out the thread.
Also, this is an add-on, and so I've moved it to the add-on forum category.
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