Further update. I was worried about Nala being left alone sometime since she's only 3 and Judah is 10 so I adopted another pair of platinums from The Pet Glider back in January. I renamed them Ronald and Reuel since Eladio and Petal just weren't cutting it for me.
Ronald and Reuel went through usual quarantine procedures then I shifted them to Nala's old Brisbane cage next to Judah and Nala's flight cage. They had a sight block at first so they could smell and hear each other but not have visuals (or reach out to each other).
Gradually, I removed the sight block but just never had time for a proper introduction to integrate the cages.
Yesterday, I finally had time to get them introduced so I took a clean never-used colony pouch (with the Grinch on it) to the bathtub around 10 AM (when I knew they 'd all be kinda sleepy anyway) then grabbed the sleeping pouches from both cages and slowly coaxed them out of the pouches. Judah was somewhat frantic to get away from the new gliders but finally settled down and went into the new pouch with Nala. The other two also cautiously entered the pouch -- a little bit of crabbing from Judah now and then but really nothing major and certainly no balls of fur (thank God!).
Soon enough all were sleeping in the new pouch. I let them sleep in it in the tub for a couple hours then transferred the Grinch pouch to the big flight cage with another fresh big colony pouch. I'm keeping the Grinch pouch fresh for Christmas (:D). When they woke up, Ronald and Reuel were all over the cage exploring their new expanded home and Nala's toys. Judah kept somewhat separate on a branch but there was minimal crabbing and he seemed to have no problems going back into the pouch to sleep with everyone this morning.
Long delayed but so happy to have them all in one big happy family together.