Another vote to just pour, a cubic meter of concrete isn't very expensive. The crane truck you will need to move a block like that will be real money, and you still have to dig a very big hole!
It cost me about the same to get the digger in to drop in the hole and footings for the deck. Pouring concrete isn't hard either, you just need to be prepared. We had a big column drilled with a 600mm auger bit, set in a bolt cage and then have a steel pier above that.
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