No need to change the coolant again.
Just open expansion tank cover to depressurise, next open clip that holds pipe on and move back on hose, place a small glass jar under the flange and pull hose back slowly, twist a bit so only bottom seeps. Drain until glass full, push hose on again.... empty jar into mineral water bottle (2L) repeat till no more comes out, about 1-1.5 liters.
Done it this way once with small amount of coolant loss.