Make it a twin and enjoy. I just found out a quilt I am doing was sewed on 2 different machines and aren't matching up when put together. Not sure what I'm going to do yet.
Yes, UFO's are yuk!
I would make it a twin and be done with it. You do not have to punish yourself for not completing sooner.
Life is too short. You want to enjoy the time you have set aside.
Like all the others I would say finish it as a twin, keep the rest of the fabric in your stash and have the enormous satisfaction of finishing the first UFO of the year!