This movie improves upon andymac's level 1-A by 18 input frames (address $1C5D, 1u) and 2 realtime frames despite Snes9x's faster fadeouts/loads.
Leaving this here in case somebody else is already working on this game and/or I forget about its existence for an indefinite amount of time.
Requires BizHawk with BSNESv115+ but may sync on the regular BSNES core; I haven't tried.
Improved version here.