I used rubylith in a double AA Mag light, for many years and though I was no sweeping my paper with it, it was handy in the darkroom, for under shelves searches and looking to the back of my bookcase/shelves.
Try fitting this type flashlight with rubylith, no the high powered bulb types and see if it will fog your papers, from a distance and close up for a minute or three and if it's OK there, then your safelights (which will still need testing when in place) should be safe with that material, even if it takes two or more thicknesses.
Of course, keeping a light proof card or sheet of paper, (a sheet of large exposed photo paper with rubylith would do) by the enlarger, for your current easel/paper size, would also help keep exposure down, as in my experience, I do no leave a photo sheet unexposed for more than 15 seconds, unless there is a misadventure, right as I am about to make/have made the enlargement.
IMO.