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"heating the case could melt or damage seals or even worst cause the case to crack"
Well, it really wouldn't need that much heat. But the wax method sounds intriguing. I've used a similar technique to loosen seized studs and bleed screws. Heat the culprit, then spray it with the penetrating oil of your choice.
One other method would be to use a pipe wrench with good sharp jaws. I can't believe that vise-grips didn't work, unless they were cheap ones or had worn jaws. I've used vise-grips to remove a theft-proof lug nut when I'd lost the key. Had to use a C-clamp to close the vise-grips and a big pipe, but it worked.
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