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That should work fine H. I haven't built any telescope piers but I have built 12m high columns where the adjoining slab needed to be separated. You could pour your pier/block combo then once set, wrap it with one or two layers of AbelFlex with the tear-off strip to the top. Once the slab has cured you remove the tear-off strip and the fill the gap with some Butyl mastic this is to stop moisture coming up through the gap but is flexible enough not to transmit vibrations.
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