If you are feeding BML - you can throw the Glidamins away. BML has more than enough vitamins in the recipe and any additional supplements would be an overdose.
Hang on to the Glider-Gravy. It is indeed HPW Complete and in a pinch you could mix just enough for a day's feeding for your gliders if BML is not available for a night or two. (good for traveling or if you have a power outage and no freezer.)
You can offer a few pieces of the pellets - if your glider will munch on them to help clean their teeth but I would not leave them in the cage at night when you want your glider to eat the BML, mixed vegetables and fruit you offer for dinner.