Hi,
I've seen how the designer currently works and I was pretty much expecting it to be like that, I do have some ideas though that would definitely improve it.
First of all, I think that seperating the weapons and outfits within the designer would be great. You could swap between all your outfits and then have the weapon you currently want to use. If you want the same outfit with 2 different weapons, you would be able to swap them easily without having to copy the whole outfit just to put a different weapon in there.
Now when it comes to the different combat styles, you could simply add a "Primary Combat Style / Secondary Combat Style" tab within the weapons tab in the designer. With that you can always edit the weapons you want to have for the different combat styles and there won't be any troubles if you change your combat style while actively using an outfit with a weapon from the designers tab.
Greetings,
Sammy