I remember a cork-on-concrete kitchen floor, it was great for all the reasons you say; I remember plates bouncing.
Ooh, that sort of 1970s deserved to be corked over.
Only problem I forsee is if the ceramics have a fairly noticeable furrow along the groutlines, especially if that coincides with a cork tile edge. It might be a good idea to whizz over the floor with a bit of filler first.
Used to be able to get cork sheet, which might be better in a smaller kitchen.
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