amphetamines like Adderall and Vyvanse make my anxiety skyrocket through the roof.
I think if I took them during my attempt, I'd overwhelm myself and have an anxiety attack or something and do something stupid and impulsive, which goes against how I want the final moments to be.
instead, I'd want to be calm and collective to the best of my ability, not anxious and having thousands of thoughts running through my head.
on the other hand, like you said, the comedown is terrible at times and could certainly serve to give an extra push someone. for me personally, being at peace with my decision also involves not needing encouragement of any kind and going on my own accord. a comedown would make me impulsive.
personally, stimulants could be nice to use during the final few months if you were exploring and traveling the world, enjoying the last bits before you go. but, for me, it would be counterproductive during my attempt.
nonetheless, I hope things work out for you and you find peace.