As soon as I get back to emulsions (it will take time, I'm currently working on my motion picture lab project), I will definitely try this. If it works well enough, no need for corona treatment. Also, it would be interesting to see if this works with acetate. This probably wouldn't cause wrinkle if coated with emulsion right after NaOH treatment and wash.
Also, it would be interesting to see how long this treatment lasts. My uneducated guess is that corona discharge causes much finer "teeth" in the material, providing best coatability but smooths out quite quickly, whereas the NaOH treatment would cause larger "teeth".
This has to be tested with a real emulsion, but you have done a great job for the first stage testing.