To add a few minor tips: Switzerland is one of the safest countries on Earth, everything is very expensive indeed (downright exorbitant at times) but other than that, you really shouldn't expect any difficulty.

France is a little different. The countryside is generally very pleasant and charming, but Paris (and several other major cities) can be a little stressful at first. The current security level in Paris is very high, so this might be one of the safest times to visit actually.

Nonetheless, street crime in Paris is a fairly serious problem by European standards. Not just in the suburbs, even downtown. I was nearly mugged once in broad daylight on a major avenue near Bastille and had several other unpleasant experiences elsewhere (particularly at Gare du Nord). So it's best to stay sharp and avoid wandering around at night on your own unless you know exactly what you're doing.

You may carry a non-locking folding knife with a reasonably small blade (3" or less IIRC) without any undue concern. Just don't flash it in public places. Carrying a folding knife in a bag rather than in a pocket/ready for instant deployment is a good idea, could save you some trouble. Either way, you may expect some leeway as a foreign tourist as long as you behave yourself.

If by some chance you find yourself in any kind of situation involving the French police do exactly as you're told, without the slightest hesitation or resistance. Keep in mind that the French legislation is very strict in some respects and the police has a lot of authority compared to many other Western countries. Any attempt whatsoever to resist or disobey an LEO will get you in a world of trouble fast.

As far as SW radio, I don't think it's needed other than for purely personal enjoyment (if that's your kind of thing). Both Switzerland and France have excellent infrastructure and access to information is going to be easily available, particularly in the urban areas.