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I've successfully used screwbolts around the house eg. for hanging a couple of decks where the brick courses were not very high and have not had any movement. As I understand it, they cause very little lateral force compared to dynabolts (excuse me if I am wrong - but this was the advice of a couple of builders). I have had personal experience of splitting a couple of cement bricks (as a test) with a dynabolt and no splitting with a screwbolt. So... I'd avoid the dynabolts in your situation, consider the screw bolt - so long as you can drill some reasonably straight holes or probably go with the chemical anchors.
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