You've got to be patient and wait for the pac-man experts to answer you. They are not sitting by the computer just waiting to answer questions. So relax and just wait for an answer.
What I can tell you is, if you don't have access to reptile vitamin and calcium supplements. you can feed the crickets vegetables like carrots, oranges, sweet potatos, and zucchini. The carrots are especially good for beta carotenes which the crickets will convert to vitamin A.
I would think if you got your hands on a ZooMed light bulb, I would think you would be able to get their vitamin and calcium supplements.
The rest of your questions will be better answered by people who can actually keep pac-mans alive. Good luck.