Perhaps have a wee think about the basic premise you are using, John. I am not sure that it is entirely valid.
If I want to enter a PDI into a digital image section of one of my camera club's competition, I have to resize it to a Jpeg not larger than 1400x1050px to suit the club's projector. Additionally, the rules limit me to a 1Mb file.
Now, you would think that making a 1½Mp Jepg from a 36Mp Raw file would suggest a huge reduction in resolution. But that premise fails to take account of the viewing mode. In our club, that "wee" 1½Mp image file is being projected on to a screen approximately 10 feet by 7.5 feet and the front row of seats is at least 15 feet from the screen.
At that viewing distance and projected image size, the resolution/sharpness/detail of the viewed photograph is every bit a good as a 35mm Kodachrome 25 trannie projected to a similar size.
The same would apply at smaller screen sizes and correspondingly lesser viewing distances.
So, I guess what I am saying is that I am not sure if you would actually gain anything, in terms of viewed image quality, by converting from a digital file to a slide for projection purposes.
I'd be interested in what others think.