I am not against the idea of having a single switch which knocks out protections But the idea of no auto trim in manual flight goes against the concept of AB FBW.
Actually, that is pretty much what i was trying to suggest. No, direct law, although extremely easy to fly in, isn't really needed, alternate law without protections is enough if the hard protections decide to act up. Now, the downside is, that such an event is extremely rare but we still need training for it and there is of course the possibility to use such a switch in the wrong context which could lead to incidents as well.
Nigel makes actually an excellent point, although the big difference is that the perpignan crew was obviously unaware of the problem with their AoA vanes, whereas a crew disabling the protections should be aware of what they are doing.