Swap FET TO-220 pinout
You have several options:


create new board with proper pin order (expensive as you wrote, but it's the "cleanest" solution)
find MOSFET with order of pins you need (it is hard to find such MOSFET with proper parameters)
bend pins (carefully, so you don't break them) - solder Source and Drain pins directly without bending, and bend just Gate pin towards limiting resistor
use wires and heat shrink tubes (so MOSFET is not soldered on the PCB)