I would.
Q likes Mash in the regular season. He liked Carcillo in the regular season before that. Carbomb didn't play one game in the playoffs last and he's a huge upgrade over Mash.
Q only plays enforcers in playoff games when he's shorthanded. But all of Toews, Kane, Hossa, Panarin, Anisimov, Ladd, Kruger, Teravainen, Flash, Desjardins, and Shaw all have Q's full trust and will all play as long as they are healthy.
That leaves one spot open in the lineup. In a playoff game, I think Q goes with Panik, Rasmussen, and Weise over Mash. Hell, wouldn't surprise me to see Bickell recalled and be given a chance by Q. Both are terrible players but at least Bickell has had previous success in the playoffs.