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I think you could try speciAl ordering one from wholesale sports. They are a vortex dealer. I am not sure if you could buy a regular vortex spotter and call them and see if it is possible to upgrade it. Perhaps call them directly?
If I'm not mistaken, I think that Select Shooting Supplies has a high end Vortex Spotting Scope with a reticle in stock and pointed (looking) out their front window.
I just checked vortex's webpage and it looks like they only have one ranging eyepiece. It is for the 85mm razor line. I am not sure if there are other eyepieces available but that looks like vortex's only reticle model.