We had a very simple method:
PF called for configuration change, e.g. "Flap take-off"
PNF did it, e.g. "Speed checked, selected"
FE confirmed it was happening, e.g "Running"
PNF stated when configuration had been achieved, e.g "Take-off and out"
FE confirmed, e.g. "Confirmed".
But I'm not sure whether an additional "Speed below 229 knots, flap and slat take-off and out, Mr Copiglet, if you please" is actually needed.