Howdy Clevtrev,
Well actually it already has, years ago that it is.
I once stared at some Vin brake parts at a swap meet with an eye towards making the worn out shoes on offer cores for trade in when getting new linings - that is until I started arranging re-ligning here locally - many of they had worn cambered when viewed in cross section from uneven loading on the lining face which in turn had even worn the pivot bores on a few.