Is garlic peel safe to eat?
Garlic peel isn't dangerous to eat. Most people wouldn't want to eat it, since it's pretty papery and can sometimes be a bit tough and fibrous, but I guess if you don't mind, go for it.

There's not really any difference between the outer and inner layers of the peel. The color is just an attribute of certain varieties of garlic; some garlic has that red/purple peel, while other garlic just has white (or off-white/pale brown) peel the whole way through.

If it's only about spending effort to peel, see How do you peel garlic easily? - it's never going to be instant, but it shouldn't be terribly time-consuming either. If it seems like it's adding a significant amount to your cooking prep time, there's probably room for improvement.