People misunderstand the whole mechanism of switch melee, it can be done with every primary weapon, any secondary and ANY skill.
Most people think you can only use it with Weapon Pro and nova, in which are the best choices for switch melee, but when it comes down to it; you can pretty much do it with anything.
The way it functions is by throwing you're grenade, and then the simple R3- Triangle- R3 it might take you some time to perfection it.
The whole Double melee thing has calmed down, so I don't think people would get that angry, just don't spam it for every kill. GL