Here is the backside of the rotor/hub. They leave the original studs in, cut them flush on the face, redrill for 4.5", tap new holes for the stud length of choice.
There has been several threads about the safety of wheel adapters.
So... if I had to choose between what I see there and the wheel adapters, I go with the adapters.
Those bolt heads overlap the original stud heads so the bolts cant be properly tight or stay tight. A allen head bolt miight suit that application better.
I still prefer off the shelf parts though. When you need another rotor, hub, or axle you'll be "out of order" until the new part is also modified.
No one asked for my opinion so I probably should keep it to myself.
I see quite a few things in different threads that I dont consider safe or pratical. Most of the time I just say to myself, " Its not my car ".
Good luck and happy moparing to all.