I'm sewing pants for a (late) Christmas present. While sewing down the fly I had accidentally drawn the curve directly over the zipper's bottom stop. The needle broke, but worse was that it made a hole in the fabric of these brand new pants I've already put 12+ hours into!

I took out my stitching and added a patch of fusible cotton woven interfacing to the reverse before re-sewing, but there's no way this is going to wear well without doing more.

What can I do to make this more resilient? I don't have matching thread, and it's an awkward place to have something like a patch or embroidery (especially on something new). I can't use a machine stitch there, obviously, but I can hand stitch.

As added fun (sorry for the yuck), photo of my left index finger. I was threading my machine needle. The machine lowers the foot for threading and raises it afterward. My finger got caught between the needle and foot when the foot went back up. The needle was most of the way through the pad of my finger from top to bottom about 1/8" from the outside, but then the foot raised another 1/8" after a delay and the needle completed its journey all the way through the pad of my finger and out the other side. Thankfully my partner was there and suggested removing the foot, because I was not in a great frame of mind, trying to figure out how to get the foot back down.

But anyway, help with fixing the hole in the pants please?

Help! Late Christmas present and I already messed it up (and OW!)