I do this every year, some times many times in a year. With films at 400 ISO or lower (might be ok with faster films but I've never done it, if you need faster maybe just take 400 and push a stop or two instead) carried on dozens of times, I have never had a single fogged or ruined film. BTW, 'hand checking' is definitely specific from country to country and different regions. I hear of this a lot from people in the US but I think it's unheard of the UK as you get funny looks when asking, I haven't had to ask for years anyway. Nowhere I fly through in Asia seems familiar with the concept either.
Carry the film onboard with you, let them scan it through security as much as they like and no worries. On one trip a few years ago, I got delayed and took a wrong turn, somebody moved a barrier behind me and I was wrongly required to go through security again at Paris CDG. It's an airport that I just don't get on with at the best of times anyway. Point being, by the time I got back home I estimated that my film had been scanned maybe ten times or more on that trip alone, the film was all fine.