You can get a lot of detail out of paper negatives, much more than the
gum process itself is capable, and they work great for monochrome gum.
However, exposure times are very long, which is a greater inconvenience than
sharpness.
What you might consider is this.Separate your slides onto 35mm B&W negative
material. You could separate and develop the negatives by reversal to give
you positives, and then go from there to your inexpensive litho film as
negatives. Or you could go two steps with regular processing. Either way
it would not be very time consumning because you could make a lot of
35mm separations at one time.This would be a piece of cake with a inexpensive
slide copier.
Sandy