Did you consider an igleheart fork? And would the extensions not have an effect on how the fork performs?
I had a look and took some measurements. The frame was custom designed for a fork with a crown to axle length of 435mm and a specific rake (can't remember what it was). The fork mods will bring it in within 5mm of those specs with just a little more rake which will ease the rather steep 71.5 deg head angle.
In effect, the angles, rake and fork length will be the same as a Yo Eddy with a 80mm fork- as set up I have enjoyed riding in the past.