Two problems: 1. Raising wages is something that the private industry decides, not the German Government. So you can wish for it all you like, but it ain't just "going to happen". 2. The effects you want from this are not short term, they're long term effects. Greece will either be bust or healed by the time this takes effect.
But let's talk about how this would boost the employment market in southern countries. You seem to assume that a) Germany's export income would sink, presumably because cost is too high, prices rise and people buy less German stuff. and b) southern countries manage to somehow balance this by producing the deficit that Germany can't sell on the market.
What will happen is that you get cheap ass trash on the market that's low quality. Nothing stops you from doing that. People don't buy German stuff because it's cheap. They buy German stuff because it's a) high quality (cars, etc.) or b) highly specialised and you can't get it elsewhere (biotech, environmental tech, industry mechanical stuff).
That's a lot of assumptions you're basing your entire argument around. And no, most economists don't necessarily agree with you. Otherwise Germany and the EU wouldn't be doing what they're doing. And here comes the whole conspiracy spiel into play where you say this is on purpose to keep the southern states down... and this is the point where I lose interest, because you clearly haven't thought this through with all the implications your idea has. It's not a bad one, I'll give you that. But it won't work. Not in this situation under these conditions. And certainly not within a week or two while banks are closed and people run out of money to buy food.