Rock or mirror could be very small and not dangerous. My thinking wasn’t defense but something that could be used to cut fabric, cord, rope, etc in an emergency.

For razors, if it’s a part of a shaving kit is that really an issue? Everyone shaves something at some point in their life and that cant be disputed, it’s basic hygiene. One could argue they might spend an extended amount of time away from home in which case razors and other items would be necessary. Razors with replaceable blades are very common and more cost effective.

You ultimately have to make your own choices for gear and I’m not trying to sway you one way or the other for anything, just throwing ideas around. Good luck!