Spraying smooth brome

Maybe some of you like smooth broke, but it has a small window of feed value in my part of the world. I am looking for something that will kill it. Ideally I would graze late or hay early, spray it, then plant millet or something for a fall crop to hay or graze. Any ideas on what works the best would be great! Also any ideas on Kentucky blue grass? I like it in a mix, but some places it has choked everything out. Thanks.

Spraying smooth brome