There is no way to do it in Orekit, but for sure it should be something we add in 12.1.
Well the reference thread is for the transform from satellite to ground, but the idea seems similar to me: in fact we should have both computations available.
The Vector3D class has a constructor that takes az and el (alpha, delta)? You should be able to use that, then scalar multiply the result by range. Just be careful that alpha is the mathematical angle (anti-clockwise from the x-axis, or East in your case) and az usually means clockwise from North.