You know they make adapters right? I think Agri Supply had what I needed. I converted my shear bolt setup to a non-shear bolt and slip clutch to avoid the headache of frequent broken bolts.
That may be a solution to a problem you don’t have
Would there be a problem with replacing the shear bolts with grade 8 and adding the slip clutches? When I hit something the slip clutch would do its job. That would keep me from having to buy new shafts. What I really want is the slip clutches, those bolts are a pain in the rear. I can hit an ant hill and break the bolt.