Jerry,
Personal view only, this is just me, a Hershalism.......if your numbers are rejected, then there should be some explanation as to why.....whether easy or hard, at least you should have some direction.
Of course, I can only really speak to how I do things.
My personal point of view is that your bench techs should be able to do a measurement, take the $6 calculator from the grocery store (the $6 one because you need square root) with pencil and paper, and calculate the MU.....anything else is at the wrong level. Of course, that is just my opinion.....
Hershal