I think Mt Lofty would be aiming a bit higher than Div 6. I'd imagine the SAAFL would accept them at about Div 4 level . From an outsider looking in its actually not a bad move. Metro South is a very strong junior comp and the Amateur League at those mid range divisions don't pay out ridiculous amounts for players. So financially it would be a smart move.
i would think NOT. I reckon a few clubs might have a bit to say about that!
One of the conditions has always been that if you want to enter the SAAFL you start from the bottom.
So I would highly doubt they would let them in at Div 4 as it would make a mockery of their whole promotion/relegation system, which Mt Lofty have a problem with it seems anyway!!!
Take your lumps and go down to Country you bunch of sooks!