.Actually Steve McCurry did exactly that ... he took one picture of him standing next to a taxi and the rest were of people and places who/which meant a lot to him.
To answer the OP:
'd load the roll into Steve McCurry's camera, take one picture of him, then turn it over to him for the last 35 shots! The last roll of THAT film deserves a lot better than me!
.+1 ... I absolutely agree!
Finally, as for doing justice to the last roll:
The greatest justice you could do would be to take perfectly exposed and composed and lighted pictures. I would do whatever it took to make that happen.
Image having the last film roll ever to be produced given to him and the exposure of some of the images are messed up, that would've been a great shame ... sure he could've got another roll and re-do the shot but then it would not have been with the last film roll that was ever produced, thus losing the impact, meaning and the soul of that video ... It was very wise of him to make "test" shots with DSLR and then get the perfect exposure with Kodachrome ... it showed his respect for Kodachrome and what it meant to him.