I was just coming around to that idea. Sign him for one year for cheap (1 million-ish), and make it clearly understood that he's here to be an offensive exploitation forward and PP specialist and that he's not going to get top-6 icetime. There might be value in that.
He's old and slow now, but I bet he's still a damn sight better than the average fourth-liner.
Somehow I doubt it would fly with either the Habs' FO or Kovalev himself though.
People don't realize that Kovy's success comes from playing with Tomas Jagr and the other way around. Pleky's speed is what conplements Kovy's lack of speed but he feeds from Pleky's passes. I believe Kovy can still play in the NHL and with the Canadiens. He couldn't do worse than AK46 or Bourque for God's sake.
The man bring people off their seats and when he plays well, he's dominating.
Honestly, if they can't get anyone else who they feel comfortable giving top 6 minutes to via free agency or trade and signing Kovalev to a contract would allow Leblanc to play in the AHL than I'd be all for it.