Cutting a hole in asbestos/cement siding
I've worked in the asbestos regulation industry for years and I can tell you that it's easy to go overboard with hysteria and fear. As the homeowner, you're entitled (within limits) to do what you want with your asbestos as long as you don't endanger others by causing an air pollution hazard or waste disposal issue.

That being said, carefully grinding a hole through a few asbestos shingles is not going to be problem if you contain dust within a simple plastic enclosure, or a stream of water. Pretend you're working in an archaeology museum and you MUST keep dust to an absolute minimum. After that, just bag your material and throw it out with your regular waste. You are entitled to certain minimums after which you must treat these materials like hazwaste.

Check with local municipal regs beforehand. They're likely on a website.