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http://www.dfrobot.com/product-1073.html TEL0073 Xbee TH BLUETOOTH 4.0 using Ti’s CC2540. Digikey 1738-1014-ND
Seems to me there is a critical power issue; how can a powered BT LE sleeping device plugged into a Mayfly, wake a sleeping Mayfly once a remote BT LE beacon (cell phone) has been detected. For the TEL0073 there is a mapping to an Xbee Socket Pins (Xbee9/D23, Xbee12/D19 or Xbee16/D20) that might work.
Ti’s CC2540 suggests sleep current is in the low 10’s uA (but not sure if this is monitoring for a beacon while asleep) .
BT LE 5.0 has 4 x longer reach at reduced data, not sure what other benefits it would have to a modular sensors configuration.
I haven’t had time to dig further into TEL0073 or HM-19. The Tel0073 looks attractive for simplicity of plugging into the Xbee socket.