First, welcome to glider parent hood and congratulations on making life much better for two gliders.
Diet is always a complicated question. I'll try to answer each question.
Instant HPW from Exotic Nutrition is a relatively new product having been on the market for only a year or two so there are no long observations on how well gliders thrive being fed this diet long term. If it is made in the US - it will contain the same synthetic vitamin K you are concerned about with BML because it is the ONLY vitamin K source permitted in pet foods manufactured in the US.
I am also not a fan of the pasteurized RAW egg product used in the add water only glider diets or the powdered honey which contains anticaking agents to prevent it from absorbing moisture and getting sticky during storage. I do not think gliders need these additives.
Feeding plain boiled chicken or scrambled/hard boiled eggs along with fruits and vegetables is a good SHORT TERM diet for glider. My gliders consider scrambled egg night to be a real treat (nights I need to mix a batch of their staple but put it off until it is already time to serve dinner to 12 hungry gliders).
The problem lies in the fact that both chicken and eggs are too high in protein to be served straight over a long period of time. They are also too high in phosphorus and could not be balanced no matter what high calcium fruits and vegetables you choose. Gliders do not need an extremely high protein diet and long term it can be hard on their liver, kidneys and digestive system.
The most reliable way to feed your gliders a balanced diet long term is to choose one of the feeding plans that have a nectar like staple that will provide the protein, vitamins and calcium your glider needs each day. Variety is provided by offering many different fruits and vegetables with all glider diets (except BML because of the amount of calcium in the recipe requires high phosphorus vegetables for balance)
I have links to several widely used glider feeding plans on my web page to help you locate the information. My own GliderKids Feeding Plan is one of those options. I offer several variations on the basic recipe to meet owner preferences that have been expressed over the years.
http://www.gliderkids-diet.com/Staple-Recipes.html
One GliderKids recipe is similar to BML but contains a human grade calcium supplement in an amount that allows you to feed any fruits and vegetables you choose.
Most of my recipes do call for Wombaroo High Protein Supplement because I feel it provides a good balance of vitamins gliders need and it uses a human grade Vitamin K supplement because the Menadione synthetic vitamin K is also banned for use in pet foods in Australia.
You can order Wombaroo High Protein Supplement and bee pollen from the Pampered Glider. She ships very quickly;
http://www.thepamperedglider.com/supplements.htm
I purchase both the bee pollen and the Now Brand Calcium Supplement at a local Organic Food Grocery Store called NutritionSmart. I also by my locally produced honey there because I can get a larger container at a lower cost than available at the grocery store. If you need to order the calcium on line you can get it here:
http://www.luckyvitamin.com/p-881-now-foods-calcium-carbonate-powder-12-oz
and finally, yes you can use the same combination of yogurt and juice in my recipes, or you have the option of using one of the green juices (Odwalla, Naked or Bolthouse brands are fine) and adding an additional 1/8 teaspoon of the calcium supplement to make up for the calcium found in the yogurt juice.
Look over the options and feel free to ask questions if you need help choosing the staple recipe that will work best for you and your gliders.