I’m not the first to dislike the hourglass that signals pending change during a presentation. Perhaps I can ask about this in a more useful manner.
Often when running a slideshow, images do not fill the screen completely. Many presenters prefer to operate with a black background. The result is that the hourglass icon appears briefly before every change.
Remaining Reptilian Brain Bits (RRBB) instantly interrupt human attention and divert focus to the icon. Which goes away. For awhile.
It seems to me the Very Best Solution (VBS) would be a toggle added to options that would select between two icons: the current one, and a transparent version. I don’t know a thing about your code, but would guess this would actually be quite simple.