Replacing Maze 3 Barbs



See my Sig
I have a 3/8" WC setup right now (Maze3, BIP, Mag3), and I'm thinking about going to 1/2". I'd really like to avoid spending the extra $42 to get a new waterblock with 1/2" barbs. I'd like to just take a wrench, unscrew the current barbs, screw in the new ones and add a bead of silicon (or caulk).

What do you think? Easy/hard? Worth it?