undulating humming

If you, like me, are amused by randomly using ｆｕｌｌ－ｗｉｄｔｈ  ｃｈａｒａｃｔｅｒｓ, how do you type them? I used to use some German website that made Opera crash, but I recently wrote an SML command-line program to get them. If I had XML-generation skillz, I'd make an OS X keyboard layout for them, but I don't, and don't feel like spending half an hour in Ukelele doing it by hand. (It would have to be a separate layout from the one that lets me type

◄◄ Γ ⊢⊃◻⊆ σℍιτ Łικε ⊤hιs ⊣ Δ ►►,

because I pretty much filled that one up, unless you count "dead keys", and typing a dead key before each and every full-width character would get old really fast.)