The lead I was looking for. As a result, I wound up finding rolls of acetate film
here in what appear to be fairly common film widths. Also, I was able to find multiple sources of 20" and 40" wide clear polyester film in various lengths and thicknesses (from 1 to 7 mils). An example is
here.
If I had the time, space, and disposable income, I'd be all about getting some coating on. Good luck in your endeavors! Oh, and when you do get your production line ready to roll, let me know. I'd love to assist in testingas long as I can get my old Rexo refurbished.