Welcome, glad you have joined us. But so sorry about your problem.
Looks like you have it all under control. Your brooder revision is exemplary of how to do it right.
If you haven't already done so, I would clean the wounded area with a tissue or cotton ball and hydrogen peroxide. It helps hide the injury.
Also change your heater light to the red bulb type - it hides red and will help you get them back together.
Feel free to ask questions.
Good luck with your babies.