Super Glue it.
+1.
Just wanted to follow up with how things turned out: cut was pretty darn painful on the downhillls, manageable on the flats and fine running up hill. Real glad I saw our neighbor the ER doctor before the race as it gave me confidence to push through. Ended up having a really fun day - it was a truly great day to be a part of.
For those facing similar situations in the future my advice is to first see a doctor who knows running to make sure you wont do more damage and to get advice on how to prevent infection. If you get the ok to run, I tried the second skin stuff a couple days before the race and it didn’t feel too good for me so for the race I went with the old standard: a waterproof bandage covered by duct tape. Worked pretty well - no discernable major damage after the race.
Thanks again to everyone for their advice.