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@Dammit
I was just thinking that the issue you'd want to avoid would be the second/top layer slipping under load, hence you'd want to locate it so sideways movement was prevented.
i.e. the nightmare scenario would be the weight of the shed pushing the top-up layer horizontally along the main slab toward its lowest point.
An SDS would put a 10cm hole into the slab in seconds, squirt in some epoxy, drop in the rebar, then either adjust to height, or cut it to the correct height with a grinder when the epoxy has set.