Well I feel stupid for not trying this before now....
It's possible to use the
Magnet scroll before Mordamir taunts the player about not having any more defenses. Doing so negates the need to hold A/B through his taunting monologue and doing the spell afterwards. This shaves a bunch more frames from the end of the game.
Can someone with power replace the movie file with the following
User movie #53712640492961666?
This does alter the end game making the above encode SLIGHTLY off. Essentially, Mordamir's monologue text will display slower, but the game will still finish as before.
Assuming acceptance: if whoever encodes/publishes the run wants an input file that uses A/B inputs to display the text faster, I can provide that. But this new .bk2 is the earliest I could get a final input to beat the game.