Heh. Why didn't she get a plaster put over it or something?Even if you could get plastic surgery to make your nose look like a Bajoran's, imagine the looks you'd get from people.
I remember hearing a story about how during a break in DS9 filming, Nana Visitor went out shopping while still in her Major Kira make-up, and a saleslady asked, "Oh you poor dear, what happened to your nose?".
Probably more complicated than that if you wanted it to stay. Maybe a "balloon" under the flesh to stretch it, then sewing individual "ribs" underneath it once it had distended to the required amount?Bearing in mind even Nerys said she had a busted nose when on earth... l'd say yes- maybe a stepped prosthetic under the flesh?