I don't acknowledge the term "bimbo", but I'll humor you as I know what you're talking about. Of course a "bimbo" could be a feminist. If by "bimbo", you mean a woman who dresses in skimpy clothes or has sex with a lot of people, then that should have no impact on her ability to believe in and perpetuate the equality of the sexes. If you mean an uneducated woman who is easily manipulated, I don't think that would affect her ability to be a feminist either.
Yes, of course I'd be o.k. with a feminist "choosing to be a bimbo". As long as she's not hurting anyone or breaking any laws, her life is none of my business. That is what feminism is about-respecting people, and I would respect her.