This would work, giving white text which would be readable if over a dark area of the print. In the 'old' days, we used to type what we wanted on a white sheet of paper, photograph it with 8 x 10 film, then trim the resulting negative and tape it to the easel. It would be in contact with the bottom area of the print when exposed, producing a white area with black print. You could try variations of this depending on what you wanted to be the result.
Bob