I just had the same fight with 2 really old front calipers from an xtz 750. All four pistons were very much seized in place.
My recipe for removal was.
1.wait till the wifes out of the house for a few hours.
2. preheat oven to 180C
3. find an old oven tray
4. place afor mentioned caliper's onto tray
5. bake for 4 mins
6. remove from oven and free the pistons using vice grips.
I was renewing all the internals of the caliper's so wasnt to concerned about gouging/scratching the pistons or the fact that 2 seals melted.
Took minutes to remove once out of the oven. The previouse day I'd used about an hours worth of foul lanuage and shouting to no avail.
I've just cooked the sunday roast in the same oven. If i dont post again soon then you'll know It's a bad idea and may poison you..
Good luck.
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