I've done it. I have modified an old receiver that I mount in the bench vise for just this purpose. The receiver acts as a heat sink when bending the handle, to ensure the bolt body or locking lugs do not get too hot. Heat with a fine and very hot oxy-acetylene flame, work fast.

The underside of the bolt handle needs some material to be removed and profiled before you bend. A lot of trial and error on scrap bolts before I got it figured out to work right.

Once dressed, finished and oil blackened it is difficult to tell (other than maybe BSA martial markings!)

The rifle bolt without a doubt has the best ergonomics for working the action. It was an option on any and all of the carbines offered. I note that most serious hunting rigs do not have the carbine bolt fitted.