This is something I have given some thought to... I think the only thing that matters as far as leverage is concerned is over/underhang (and binding angles). I don't think the center disk or any other interface on the boot/binding matters.
There's a Sundown Ski on Long Island that has what you are looking for on their wall. Maybe they want to sell.
Sundown Ski
47 Northern Blvd.
Greenvale NY 11548
516-621-6668
It's the black/red/yellow scribble paint. I didn't look at the base, but the top looked ok. It had wear but no big problems.
I think Burton bindings might go up to 16? I say this because I have a set of Variplates, and at MP30 feet I still have two clicks of expansion left on the blocks! I think it's because Burton boots had a larger length between the toe/heel shelves(?) So a 16 Raichle-type boot might fit.
Ah, Isn't this freeride? ;) Freeride boards are directional, and are made to be ridden with non-duck stances, although I suppose that possibly the majority of riders do so anyway.
Actually they are just having technical difficulties... after all, the site is still a beta.
EDIT:.. I guess not. I remember SAC sherrif had posted:
"Please look at the top of the page:
SteepandCheap BETA
Yes we are trying something new and yes it is not working.
SAC On even if it is in BETA!"
When I click that link I get
" This XML file does not appear to have any style information associated with it. The document tree is shown below."
I am using Wizz RSS for Firefox. Maybe I should try a new RSS program.
Looks like the oxygen website is gone. It was at http://www.oxygensnowboards.com/
It hadn't been updated since 2002. They are now owned by Atomic. According to Carver's Almanac, the Proton is sold at blue-tomato.com