The only one I know of was about 6-9 years ago - prior army helo WO, but crossed into the blue and became a normal active duty 2lt in the AF. The AF didn't care about his prior time, he went through the full UPT syll, and in the end got FAIPed (because he was still a Lt - they won't faip a late rated Capt, because they care about rank/hurting your career, but they don't care about age). He then went on to fly Vipers. I can PM you his contact info if you'd like.
I'll ask the AETC nerds around here if anything has changed since then. I think the reason the other cases mentioned above are different (abbreviated syllabi, etc) is because of the guard/reserve aspect. If you want to compete for an active duty fighter, you have to compete on the same playing field as every other active duty UPT stud.