O'DAY used to offer an optional cowl vent that was located on the foredeck, that plus the slits in the cuddy enclosure board should vent better, but won't add much light and I'd be afraid of tripping on the deck vent and either having it go overboard...... or me go overboard!
I think if you do a bit of web searching you may find pictures of skylights and ports (windows) on the cuddy sides, but I'm not sure there are any available opening ports that will fit on the sides. They do sell low-profile ("mushroom") vents that have a clear section in the center, they sit fairly close to the deck, so less tripping hazard and should not get kicked overboard as easy (plus the come with little securing bars that lock them into the deck plates. The Catalina (Capri) 16 and 18 had a small (about 4" x 6") acrylic panel set into their foredecks, would take a bit of engineering to install, but should add light with no trip hazard.
I have saved some of the pictures of what other owners have done for a hatch or ports, may try to post if you can't find on-line pics. Buying a stock, ready-to-install hatch would mean adding a frame under it to compensate for the deck camber.
Picture below are not my boat, but may give some ideas.