Think about doing a double-crop system.  For this year, maybe plant a spring small grain- spring oats, spring triticale, etc.  Harvest at boot stage.  Then plant a forage-type forage sorghum.  I think doing this will help you get past a lot of the grass emergence times.  That will help you manage the grass weeds you anticipate.  In  our area, I would plant a winter small grain - winter triticale or winter wheat - followed by the forage sorghum, but that isn't going to help you this year. 

If you could find a non-grass summer crop that fits in your area, that could work.  Say, plant your spring or winter small grain crop to be harvested as a forage at boot stage; then follow with a tall soybean to be harvested as a forage.  Going with soybeans would allow you to use products like Clethodim to clean up the grass post.  I don't know if there is a better non-grass summer crop for you than soybeans that could be used as a forage. (?). 

Maybe what would work for you is to alternate: one year do the small grain forage followed by forage beans; next year do the small grain forage followed by forage sorghum; and continue to alternate.  (?)

One other thing that I see is direct cut dough stage small grain silage:  wheat, barley etc.  What I see is this get harvested maybe 3 weeks before same small grain would be combined.  It makes a nice feed for dairy heifers or dairy dry cows.  I think this could work for beef cows as well.   This would be inexpensive to grow.  You could try double-cropping, or maybe just grow the small grain silage, and let the ground set empty over the dry spell, and just keep the weeds under control.

Some options to think about.......