I wish to second this request. Octopath Traveler has been giving me some trouble. Apparently the image files, among other things, were cooked/garbled in some way even when using your program. Is there a way around this?
There is a temporary way around this. You would have to save the base asset instead of export and use something like the Raw Texture Cooker to manually convert it to a dds. That tool has the switch swizzle info in it. It's what i used for One's Justice since the pc version isnt out yet.