Easiest solution, if you have it, is a 3/8" impact gun. The thing will come right off.
If not, then I would suggest using what remains of your timing belt and a large pipe wrench to hold the timing belt and sprocket in place while you wrench down on the bolt.
If you can use an extra long pipe on the socket, the added leverage will make the pipe wrench less likely to slip and/or move as the leverage point will be farther back than if you were just on the socket.
Just my thoughts on the matter, good luck.
Matt
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