Congrats on bringing your girls home! That's soo exciting!
You are right, the diet that they came with is not a complete or good diet. You can find a bunch of staple diets here: info.petsugargliders.com/staple-diets/.
I fed TPG and now I'm feeding OHPW.
While you're waiting for the supplies to come, you can give some fresh or frozen veggies
(Sweet potatoes, green beans, beets, peas, carrots, squash, bell pepper, peas), fruits
(Papayas, mango, cantaloupe, banana, kiwi, peach, strawberry, blueberry, raspberry, pitted cherries), and some type of protein
(cooked eggs, turkey, chicken - no seasonings) along w/ treats. they should be ok until you get the supplies for your diet.