Hi Mancklin, and welcome to the ranks of forum posters.
Thanks for the suggestion. I tried "regift" myself when I was playing yesterday's puzzle, but unlike you, I didn't know what it means, so I wasn't all that surprised that it was rejected. But I see it's in Webster's New Millennium Dictionary meaning "to give an unwanted gift to someone else". Apparently it originated (the word, not the practice) in a 1995 Seinfeld episode.
So the word and its derived forms will go into the word list soon.