In the autumn I've had the 1st 3 of your list together and the buckwheat flowered the fastest by a long way. Haven't tried mustard at the same time though.
I don't see why not but there will be others who know more about it than me. A late frost would kill the buckwheat stone dead, so a mix would be prudent IMO.
May I ask what this is for? Stewardship? EFA? Just nature? Some rules for the first 2.
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