Heaterbox Pipe Passthrough - Reinforce vs Remold

I had considered that, but I haven't done any fiberglass before and I'd rather keep this repair simple and get it back in the car. It's freaking cold outside!
I was definitely planning to fill and re-drill the hole. I've heard of that UV activated resin, but never used it. Do you have any personal experience with it? I wonder if it would crack or flake during drilling.
I bought the 5 second fix kit at Walmart but haven't opened it yet. I've used Devcon Home 5 minute 2 part epoxy on dang near everything for a lot of years. It has to be dammed with duct tape so it stays where its put while curing and doesn't fully harden for some time if thick. That's why is suggested the other, it's faster.