He was never going to take any position in the government.
I suspect he would have been sidelined into irrelevancy (as he effectively was in the last stages of the Independence process). Remember, Gandhi had an agrarian pipe dream for India where everyone would go back to the land and live in harmony while the Congress government was very much into pushing national development and industrialisation. The government would trot him out on state occasions and use him strategically to quell community violence but he wouldn't have been allowed to interfere with anything important. To keep him quiet they might well have given him a commune of some sort to run, keep him distracted.