Until you change it toss a piece of cardboard in front of the rad, it will help some. If you see the temps too hot, cut a 2" hole in it.
Drove 1200km with the old 1/8" hole trick after the thermostat seized mostly shut. Started off with a huge piece of cardboard up north, by time I made it south to Ottawa it had a few holes in it. I had nice heat all the way down.
Performance one step at a time.