At least take the time to pull it off the bike and have it patch with one of those that is a patch for inside the tire attached to a plug which is pulled thru the hole I would trust that a lot more than just sticking a plug in from the outside and betting your life on whether it would hold or not. That's for you to decide but I would never do anything with a plug or patch, new tire is the only way I would go. Again JMHO