JY....never heard of that one. Sounds pretty rare...you better hold on to that one.
Ya it would make a good swap. I would go SOA but the chances of you being able to use the stock bronco spring perches are pretty slim. You have to take into account pinion angle and width between the springs. What I would do is just shave off all the brackets on the D44 and 9" and weld on all new brackets. Just be sure that when you do the front spring perches that you keep them at the same angle as the coil spring mounts so your pinion angle doesn't change when you install it.