Can't help you with uploads, sorry, but someone here recently posted the "Heart and Soul" box set (didn't they...?) and that is the collection with the "Ceremony" demo. Disc Three, I think. Don't get your hopes up. It is a poor quality recording which Stephen Morris dug up from his vaults.
The live version on "Still" is another agonizing piece of music. The song starts off abruptly, already a minute or two in, and Curtis's vocals are also muted in the beginning! Once the vocals do kick in it's a great version nonetheless. Curtis's voice and emphasis give the song a different texture.
Finally, you should not fail to seek out the "original" mix of New Order's "Ceremony", recorded as a three-piece. Although it is not Curtis singing, it is, in my mind, the definitive version: a raw surge of optimism in one massive speaker-smashing pulse of rhythm.