Does anyone have any suggestions on how I could plug the pass-through mail slot in my solid wood front door?
If possible I'd like it to be hidden, as if it were never there.

(Some have suggested putting a kick plate over it and adding house numbers on top- but I'd prefer to fill it in with wood (if possible) and paint over the whole door. Plus if I used a kick plate on the outside, I couldn't finish off the inside of the door without it looking like a crafter's quick fix.)

Thank you for any suggestions. Just bought the home, my 1st, so money is tight and buying a new door isn't an option right now. If I have to live with the draft for now then I'll just deal. Thanks!