Raven, you said you couldn't find a vet to fix your rabbits or take care of them -- why would you get sugar gliders which are even more specialized and difficult to find vets for? Their diet is also extremely complicated -- we've got 3 in foster now and they're easily 10 times as complicated as rabbits to care for. They're also not cuddly -- which is what you complained about with your rabbits.
Before you get gliders, I think maybe you should find someone who owns them and see if you can spend some time with them, to make sure they are the right pet for you. Also for sure you will have to find a specilized vet for them.