Finally got the bar end screw out by hammering #3 phillip bit into the screw for a tight fit and having my wife hold the strap wrench while I push in and turn to loosen.
I did find glue on the screw
Pic of the stripped screw with bar end removed
After all this and removing my original grip, I noticed I received a defective grip. The rubber on the grip had a crack.
I sent an email to Oxford customer service. Hopefully the can resolve this soon. I can't ride without the grip and I don't plan to put back the original grip. It was a pain to get it off.