In my opinion this is all a massive overreaction. How often has a pilot become ill during a flight due to food being tampered with? I have NEVER heard of someone actually doing anything, despite hearing the odd joke made.
If you are genuinely worried about this happening to you then I suggest you simply look at the way you treat the cabin crew. If you are polite and value them and their job then you have nothing to worry about. If, like a minority of pilots, you look down your nose at them and speak to them like they are idiots then you may have more of a problem, BUT it is highly highly unlikely that anyone would do anything.
The fact that pilots often eat out in places (especially in Africa) where hygiene is very poor and then fly home is much more of a worry for me. A steak wiped round the bog is probably safer than a meal at some of the places that pilots like to frequent, often eating the same thing!