A few years back I worked out a method to do this. Not sure it meets your “do this efficiently” request 
but it works. It was RP8 timeframe, but repeaters have not really changed much since then.
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A few years back I worked out a method to do this. Not sure it meets your “do this efficiently” request but it works. It was RP8 timeframe, but repeaters have not really changed much since then.