Would Xykon become a demilich?

[Keltest]

Or that they even exist in the Stickverse, for that matter--it seems to be generally a fairly low-level setting, with characters even at low epic levels being extremely rare.

If anything, that should be an argument for more demiliches. A normal lich gets bored waiting for epic or near-epic adventuring parties to crop up, so they just sit there at the back of their dungeon for umpteen hundred years and turn into a demilich.