Real cheese making newbie here, but I do have a bee hive and supplies of my own wax so I was keen to read through this thread. I know that I use no chemicals in my hive so I am happy to use my own wax - if buying from someone else I would be asking if the bees have been treated with any chemicals/antibiotics etc. I would be unhappy to use mineral oil for food purposes, I much prefer using vegetable products.
There is a difference between the cappings (as mentioned above) which is effectively wax that has been used just once by the bees to seal the honey cells, and older wax from combs which may have been reused many times by the bees and 'emptied out' by the beekeeper each time and returned to the hive for refilling. This wax will tend to accumulate any treatments or pesticides either used on the hive or brought in by the bees.
I have made lip balm by mixing extra virgin olive oil into melted beeswax (for safety, always melt in a double boiler as the wax can ignite), you simply adjust the amount of oil for how solid or runny a result you require. I am sure you could similarly use just a small amount of vegetable oil with the beeswax to make it more flexible and less liable to crack, but without experimenting I would have no idea the appropriate proportion. Beeswax has a very high melting point and by mixing it with another oil/fat with a lower melting point you will make the mix more flexible at room/fridge temperature.