To be more specific. Yes, it will work in the beta, but only kinda. It frustrates me that I can't change the single kill call outs to something other than one single call out. Me and PooNanners made tons of extra call outs for the new ones in the beta, but it's just that I am not comfortable with the beta because I can't edit the dynamic call outs. I have also tried to have some streamers with the RST beta test my voicepacks but it's been super frustrating because they keep having crashes with it. When one complained about the lack of single kill call outs it really hurt me. Not cause he was trying to be mean, but because I realized if I were to release a beta version like I did with the arnold voice pack it would feel incomplete. It just wouldn't do it justice.
Edit: To be more specific about the crashes. Whenever the streamers enabled the streaming overlay it would crash their planetside client a little into the session or sometimes just right away.