I said I'd pop back from time to time!
I can't beleive this is still ongoing and Alesis have not released their custom soundsets. I'm glad I sold my DM10 when I did or I'd have pulled my hair out by now.
I STILL think a thirdparty soundset compiler by BFD or Steven Slate which would allow a sub-set export into a format that could then be uploaded to the DM10 would be a good move. Even if it was not directly marketed for the DM10 to get around potential legal issues. If this was possible I might regret selling my kit.
Good luck