Whatever is done is going to have to be on a constant basis. Face facts, the first time something is attempted is unlikely to have big numbers....we all know that from past experience. Whatever we do, we have to be prepared to do for just about every home game if not every single one.
The reality is we need numbers to make an impact, a couple of hundred of us invading the pitch (which I'm not advocating, just using as an example) will just look mad.