I have had success with keeping small "cookies" of various woods from cracking and giving me a complete full dry crack-free cookie eventually. But thats the catch, heavy on that word "eventually". Way I did it was dip the whole cookie in wax, sealing it, and then setting it on the shelf and forgetting about it. Done that with up to 7 inch cookies in birch and sassafras. But a cookie big enough for a table, don't think so. Ianab had the best shot I think, cover the whole thing in PEG but logistically that would be tough to do depending on how large this table is. They do sell PEG in 55 gal drums.
Another thing I have seen done is to bandsaw a nice neat strait cut from the outside to the center of the tree when wet. Kindof preempting the cracking. It will then shrink and that crack will widen till dry. You can then work a wooden wedge the exact size of that "crack" into the pie, giving you a solid cookie for your table.