In addition to the comments above about what to do after a double whistle, I think it would be more beneficial to give training on how to officiate your primary coverage area, a secondary coverage area, and more importantly, each match-up on the floor.
If you have three officials appropriately covering each match-up on the floor, with an understanding of primary coverage and secondary coverage areas, you minimize unnecessary double whistles but ensure every play is covered adequately.
You are starting your training with a faulty premise, in my opinion.
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