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If you skip the insulation and just pour a support pad, do you really lose that much heat from the oven surface?
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Insulate! Insulate! Insulate!
If you put your bricks directly on the support slab, it will wick all the heat out of your floor, and you will never get your oven to pizza temperatures.
You can't skip this step! If you do, you will have an oven that will not cook properly.
Be glad you asked this question first. It's so sad to tell people who have already built their domes, that there's nothing much they can do except start over.