Both the King setscrew connectors and the Ideal twisters (purple) will work but they both have the drawback of being large. This is a real problem with the small boxes used in mobile homes and if you use these devices, you'll end up adding a surface extension box to gain enough room for the connectors & wiring device.

I've run across the 3M with anti-oxidant in some homes in my area.These splices are still working fine after many years, but since this is not a tested or approved method, I can't recommend it.

Few things are harder to put up with than the annoyance of a good example.