I was just scrolling through messages and saw yours. I didn’t see any replies so I just wanted to check in and see how you’re doing. I also saw that one of your gliders passed and I’m so sorry to hear that. I lost my first glider a few years ago and know how devastating it can be.
Generally, the rule of thumb is to get the biggest cage you can afford and have room for. Gliders love to jump and climb, and of course glide. Regardless of size, it’s a good idea to have a safe exercise wheel for them to run on. It sounds like your hex cage is quite large, and while I wouldn’t normally suggest downsizing, both the Madagascar and Brisbane cages are great for 2 - 3 gliders. If I had to choose I’d probably go for the Madagascar which has slightly more interior room than the Brisbane. While it’s not as wide as the Brisbane it is much taller which I’ve heard is better for sugar gliders. As you probably know, the bar spacing should be no more than 1/2 inch. Cleanliness is very important and if your hex cage is showing signs of rust or other wear and tear then it would be best to upgrade. One thing that will really help the transition process is to keep things that are familiar to them, like pouches, toys, wheels, etc.
Best of luck and take care!