Find And Bind maxscript will scan your hdri and find the sun location.
After that,it will create V-Ray sun in this position and bind it to V-Ray Dome light.
You can rotate the rig by rotation the dome light or in the VrayHDRI map(horz rotation).
This is another little script I made a couple of months ago. It’s helping to do light setups by pinning the resulting reflections onto a surface. See the video below to get an impression of what it does exactly.