Go back home.
Cut the original whistle cord (~1/8" od), on both sides of your whistle, about 4" above it (this produces four cord ends).
Lay out the cord in it's original shape and dedicate a male/female plug to each side.
Warm up a hot melt glue gun.
Un-screw the sleeves, pass the cord thru them and glue the end of the cord to/between the thingies that wires would normally be attached to.
Screw the sleeves back on over top of the now mated cord/plug or receiver (female).
Do this for all four plugs (two male and two female).
Plug the male ends into the females and WOW you have a "break-away" whistle cord!
Go to race track and blow.