Double fixed hub with wider threaded bit?

Would anyone make one as it would mean spacers HAD to be used otherwise lockring wouldn't fit.

Can you not just play around with any washers in between cone locking nuts and move the wheel across to the right a bit and then whizz a spoke key around to bring the rim back across?

I thought of that, but really wanted to set it up with a couple of different cogs so I can flip it.

Goldtec ceramic hub is somewhat beyond my price range...

and I was doubtful about whether it was really possible, but I was just going on the fact this place is selling cog spacing kits
http://www.velosolo.co.uk/shoptrack.html
Though looking at their photos it doesn't look like there's much room for a lockring to fit on there. Still it suggests some people are doing it. I don't know... I shuold probably spend some more time trying to figure out the Sheldon link from their FAQ.