Patton would be to old and to eurocentric for Korea, which anyway is very bad tank country.
Politics and Patton would not mix. The question is if Patton would realize that or make some failed political attempts?
The biggest impact would be
a) Pattons memoirs, which were to be brutal and
b) his general comments on political events
Before Prague/Berlin 1948 the western (at least the US) were fairly friendly towards the Soviets. Patton could change that by his memoirs, other writings, speeches etc.
The view of WW2 would definetly be affected by a well written memoir/other books by Patton.