It would be completely pointless.

>>317280
why?

>>317281

because thanks to the margin-of-success rules you don't lose any amount of complexity by inverting the rolling system.

>>317282
Actually, I would say you do--less head math. Subtraction is much harder for most people to do in their heads (in my experience, at least), and if you roll over 100, you simply need to drop 100 from your roll to figure out your degree of success.