Reducing epileptic potential of Bum Rush

I figured it would be a good idea to make Bum Rush do less flashes or perhaps dimmer red flashes to reduce how harsh it is on the eyes.  I thought someone had made this hack earlier, but it turns out I was misremembering - it's just that the screen is dimmed during the attack for the SNES classic version of the game.  I tried hex coding with the relevant documents and failed to do either one of those things on my attempts.  I didn't really know what I was doing with it, but using FF3usME I managed to get a whole variety of less or more glitchy effects while tinkering with the animation settings but it seems that's best used for combining the visual effect of different abilities (and some aren't compatible?).  Does anyone know how to do this?