The rungs of the ladder are smaller diameter than the rails. That part wouldn't touch the film at all. Only the rail part touches the film.

However, I like your plastic apron better.
It can't come apart like mine can. It's also thinner can can fit on the reel better and bend around corners more easily.
Best of all, yours is an already existing product. Mine would have to be manufactured.

Now, last problem to solve...
How do we flip the film over?

Without the apron, we would simply flip the reel of film over but, because of the apron, we can't do that.

Can we "S-Wind" the film, somehow?

I'm usually good at this kind of topology but I need to see the real thing, first, in order to figure it out.