Induction cookers will not work with non ferromagnetic cookware so why not place a thick iron plate on top of the induction cooker and then place your ceramic aluminum or stainless cookware on it?

The suggestion sounds reasonable : the heat generated in the iron plate is then transferred to non-ferromagnetic cookware place on top.

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NO, THAT WILL NOT WORK!

The iron plate gets heated up quickly, but, before transferring the heat to the upper utensil, the plate's temperature sensor senses that the required temperature has been reached and it then stops further heating.

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The sensor can be re-calibrated.

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If you attempt to adjust the calibration settings of the temperature sensors in the range, you are basically defeating the purpose of having an induction range and you are also voiding any sort of warranty the product has. Let's face it, induction ranges, with all their digital controls, aren't as reliable as old-type ranges with just simple heating-coil elements, so why raise the potential for an expensive repair bill? Why not just use the extra money to buy yourself a nice set of induction-suitable cookware?