Regarding hand checking of film at european airports:
I have taken my medium format rig to Spain and Italy recently a few times. If you dont speak the language you have NO chance. I put my film in a lead lined bag and it goes through in my cary on luggage. At Heathrow, Gatwick, Luton and Stanstead I have requested hand checking. Once, was fine, they gave it a cursory look. Once they unwrapped 100 rolls of 120 film and swabbed the lot for traces of explosive. Once they flatly refused and xrayed it out of the bag. Once I didnt say anything, it went through the xray in the bag and was un-noticed. Once I tried the same thing, but they noticed the bag, then hand searched the contents briefly.
At all non english speaking airports I dont say a thing, and let the bag pass through with its contents intact. Its been spotted twice and hand checked.
In summary. If you are taking iso 400 or slower film then you can happily pass through a few machines, just get it processed asap. If you have anything fast.. buy a lead lined bag. NEVER declare it for hand checking especially if you dont speak the local language. Just let it get scanned in the bag. Chances are they wont spot it.
Put 1 roll of 3200 in the bag. If picked up, you can plug this out first and say "look, fast film, not xray safe" and hope you have a knowledgabe security officer. Of course all the above depends on the day, the world threat at the time, what the guard had for breakfast, when their next break is, if you look like a muslim terrorist or drug traffiker etc
As for camera safety in Spain. I have never had a problem. To most casual criminals a film camera is an antiquated worthless piece of junk. You wallet will be of far more interest. I would recomend some black electrical tape over the Leica red dot to make it look a bit bland. Keep your bag to your side, not behind you and zipped etc. Put the camera at the bottom of the bag and some junk ie rolls of film, maps, guide book etc on top. If you are really evil.. get a ball of blue tack about 2" in diameter. Put some pins in the blue tack, head first sot make a ball of needles. Put this in your camera bag.. Prying hands may be distracted by this.. you, knowing its there can be more careful removing your gear.