The first release for Typecaste is finally here. Nika is a display face for publications, branding and web. Simultaneously thin and chunky, Nika has a sophisticated quirky personality. Available at MyFonts.com.
Although I like radical experiments, I generally stick to the internal "rules" of a typeface, rather than make exceptions for the sake of appearance. But your premise, that only the "o" be unserifed, is also quite logical.