I tried to use this same method with my Magic V but I can install Backup but LZPlay won't load saying that it does not support this version and I cannot find a different version that works.Question where did you purchase your Honor Magic V from? I am looking to purchase mine soon and looking for reputable buyer and faster shipping.
Have you tried these two versions below. I remember when I had my Mate X2 I had installed it using the below methods.
GMS Tutorial-and Google Play Protect -
I also read that you can unlock bootloader and install TWRP then these versions will work but it's very risky with unlocking bootloader for a beginner like me so hopefully someone soon will have a way to side load Google Services