As someone who also has ADHD, I would beg you to reconsider this strategy.
Getting the first thoughts down on paper is the hardest part, especially for those who may have trouble with focus, but that's exactly why you should practice it!
It's 90% of the task, it's where you have to practice executive function to plan what you're going to write in the overall broad sense. Please don't give up on it and hand that task over to the LLMs There are a lot of strategies you can use to break through that barrier and you'll be better off by strengthening that muscle instead of leaving it to wither.