Yep. This is how the more progressive broadcasts have been doing it with OBP and OPS -- they don't get rid of the existing stuff, they supplement.
Regarding the .123 format vs. the 12% format, my concern is that without a sufficient formatting break, you're going to confuse people when you say that Votto went from being a ".334 hitter (based on AVG)" to a ".262 hitter (based on Hit%)". The cognitive dissonance would just be too much. But that's definitely the kind of conversation/testing I'd want to have.