Why not just adjust the low limit screw so that you can't get into the biggest cog? I'd imagine the hanger is slightly weakened by your fall and tapping it with a hammer may weaken it further and increase the likelihood that it'll snap off mid-ride, though I know my mechanic has bodged hangers back into place before without issue, including the one I have on my bike now. He does check the alignment carefully with a tool, though, he's not just eyeballing.

The #1 thing is to avoid the pulley cage catching your spokes. That'd be an insta-wreck at speed.

You'd effectively be running a 9 speed bike without an 11t and whatever your big cog is, but unless you're planning on epic climbs you should be fine until the new hanger arrives.