You can weaponize anything within reason if you need to. Though the usefulness of them would be doubtful.
They're about as effective as the early harriers (like the falklands ones), and armed similarly, with sidewinder and gun pods.
But I think the point is when you're being invaded, you will use any aircraft you can stick weapons on. So yes, we would probably use hawks, tucanos, even light aircraft with 100 pound dumb bombs
Oh, the hawk can mount ASRAAM as well. So they wouldn't be terrible fighters, just not amazing...