I’m unfortunately unfamiliar with IT in that I don’t know whether methods is going to show up during the course, so maybe another ANer can add their perspective.
All of the courses you have listed, as you have said, don’t have a methods requirement. If it is giving you too much stress and you’re 95% sure you won’t need methods (it’s usually STEMM and economics that need it), I’d be leaning towards switching to accounting, as long as you still take Further in year 12 so you can get the 20 raw SS in maths required. Worst case scenario, there are typically bridging courses and pathways to take methods later if you change your mind.