Your starting to sound like my old man. Just because you have a machine shop doesn't mean you should machine EVERYTHING. Its just as cheap and much easier to get the customer the right yoke in this case. Like i said, been there done that, its just more efficient to use the AAM yoke.
When the right yoke doesn't exist and they need to have the better yoke, and you are a machinist and you make it there is no efficiency issue.
There is no lack of efficiency to what i said to do, in fact in this case when 1 yoke is 15 lbs and the other is 3 lbs, who's is more efficient ?
The person who knows what machining alterations needing to be done to make it right is invaluable, and going to make it right.
A end yoke is made with a MD, TH, GH and spline count and type... If the spline type and count match, the other specs can be modified to work, i have done this for cars, trucks, race cars, boats hundreds and hundreds of times, simply because the end yoke they have or had or need doesn't exist.
No lack of efficiency, how do you get the right yoke when only 1 or 2 exist, the gm version or the dodge version. AAM is not like spicer and is not making 10 versions of a ___ spline and 10 versions of that spline angle.
So now the part you need is modified.
There is a aftermarket company making them also, which is also probably lighter but the price is big. .