You could just leave it alone, and it would be just fine.
Just tie it to a stick so the stalk is vertical (aside from the bend caused by the damage.) Once it has a little support it will adjust to the bend,
But low stress training would be a good idea if you want to put in the extra work of tying it down.
In my experience toppin does slow growth for a week or so. I do it outdoors early on caue it so much faster an easyier.
Lst is no stress an better but takes alot more work an is what i use indoors.