G'day John.
Jeez mate, 2 grand? If you know the range via your RF binox, and if under 500y, I'd have thought you'd get out of it for much less?
I'd just be going for a decent mil dot scope, work out dope, and if needed dial ele but only if the mil dot doesn't do it.
In any case, sounds like you have a clear idea of what you're trying to do so I wish you all the best...
- Bob
(I think sometimes we overcomplicate this scope stuff)