You generally can't use tripods inside public buildings, but outside, as long as your not holding people up, there shouldn't be a problem. I've never had a problem using a small tripod. I've even used a small table-top tripod inside churches with no problems. Just be sensible. A monopod could be a more flexible option.
As for the film going through the hand baggage scanners, I wouldn't worry. I've travelled quite a bit, including between Europe and NZ, never had my film hand inspected, and never (like most other people) had a problem. I would only be concerned if using high speed film.
Scanning hand baggage, including all your camera gear and film has been standard practice in Europe for many, many years.