May not be the best workaround, but I setup my wife, family and close friends as emergency contacts. they always get through, regardless of settings and they have unique tones. Then set the default message sound to nothing.
Thanks man, I think this should work for now. Although I hope they fix it before the public release since emergency contacts also ring on silent. The thing that worries me is that this feature has been missing since the beta 1, and 10 betas down, it is still not there.