Hutchinson had been in charge of the Blue Square South side since Matty Hale's departure in October, taking over as caretaker boss before being made full-time, along with Mason.
But with Herath gritting it out at the other end, McKenzie took charge, dominating the strike and hitting two sixes over square leg off Adams, before a third sealed the match.
It could have been Finnigan's final game in charge as caretaker boss as Harriers, ninth in the Blue Square Premier, expect to appoint Mark Yates' long-term successor on Wednesday.