Don't do it.
There'll be times you'll wish you had that crisp edge on the wheel. You should track your belt over the edge till you find your happy place, some times it's almost nothing and other times I'll hang that belt over a good 1/4 inch. You can also break the edge of the belt with a bar of steel so it's consistant. Wobbly belts don't help either, save them for unimportant grinding. Another maker I know radiused his 8" wheel and over time wound up with a radical slope on the right hand side of the wheel, bad enough that the belt didn't even touch the wheel a good 3/8". That makes it hard to get even grinds. He may have been heavey handed on the right too but I don't think the radius helped any. Just my 2 pennies.
Rudy