He oughta just use weather balloons and a lawn chair, no rocket needed.
‘Ol Larry Walters did it back in the 1980s and got up to 16,000 feet, much to the surprise of the airline pilots who saw him bobbing around near LAX.
The Priest of the Balloon
His training for the stunt included jungle survival and mountain climbing courses,
but apparently did not include instruction on use of his GPS - in a telephone call he made during the flight, he stated that if someone could just explain how to use his GPS he could relay his position to rescuers.
https://en.wikipedia.org/wiki/Adelir_Ant%C3%B4nio_de_Carli
More incredible was his method of returning to ground. He had a BB Gun and popped a few balloons and descended to the ground. If it was me, I would have had a parachute.