It's not that crazy of an idea though, if Boston wants to keep his bat in the lineup. Agree that it may not be fair to the pitching staff, who hasn't pitched to him, but let's not act as if Napoli isn't/wasn't a catcher. He's caught twice as many games in the bigs as he's played at 1B. The timing of him moving to catch (the 3rd game of the WS) may be what has you laughing, and that may be right to think it'd be crazy they would do it at this stage of the season.
I'm not sure that it not being fair to Salty would mean too much to Boston though, it's not like Salty is hitting a lick in the post-season, and he did just make a couple of costly miscues in Game 2. I'm just not sure anyone would be worried about a guy's feelings at this point...they are trying to win a WS, not make everyone happy.