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Just a few things to consider: I'd be quite concerned about wobble/oscillation with such a tall pier, especially with a pre-existing slab. I wonder of you could drill into the slab to find out how thick it is? Perhaps you could look into a wide diameter base (500mm or thereabouts) welded to a thinner top 2/3. I'd use the longest Chemset bolts you can get away with on the slab (that's what I did but my pier goes 1.5m underground with a subterranean buttressed base--very solid indeed). Another option would be large buttress/vanes attached the the pier--this is what people usually do. I'd certainly go for very beefy wide vanes if I were you though or you might be very disappointed with oscillation. For added heft you might like to consider filling the pier with loose sand. Some people on the internet recommend adding some mineral oil to the mixture to prevent rust but I don't like the idea of that at all! Do you know any boiler makers? If not I'm sure you'd easily be able to get a small local engineering company to weld you up a solid rig. Best of luck!
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