I lost most of a ceiling panel due to water saturation and collapse. It was removed along with insulation residue and a temporary fiber board panel tacked in in its place. Now I would like to install the permanent gypsum board, full 4 by 8 but the problem is how to restore loose fill insulation layer (only) on top of the new rock but the joist would interfere and there's no practical way to blow or throw it going into the attic. I have a drywall jack/lift. I am looking for good idea for lifting insulation along with the panel and thought maybe someone else has encountered this kind of rehab challenge.
Hoisting the insulation with the drywall panel is a bad idea. I would instead install fiberglass bat insulation between the joists. You could use the kind that is faced with paper and staple it to the joists for added support. If just plain batts are used then you may need to add some type of staple on stripping to help hold the batts in place. Install all of this except for one small area where you can go up and put in more of the loose insulation above the fiberglass if that is desired or needed. Finally close off the small area by pushing up an oversized bat that covers the opening from above and then install the final piece. If using the paper backed staple that in place. If the ceiling previously had some type of vapor barrier you need to install similar material on the bottom of the ceiling joists.
Now you would be ready to install the new ceiling drywall.