After you map with kdmapper just free all mapped memory.
use (MmFreePagesFromMdl and FreePool) 
and you will only have one page allocated

in this method i am using .data ptr to communicate (NtUserGetObjectInformation) (https://www.unknowncheats.me/forum/anti-cheat-bypass/425352-driver-communication-using-data-ptr-called-function.html)
but you can use any kind of communication

Visual studio project

Properties -> C/C++ -> Optimization

Full program optimization (Yes (/GL))

Properties -> C/C++ -> Code generation

Security Check (Disable Security Check (/GS-))
Control flow protection (No)

TODO

Replace KeAttachProcess with my Custom AttachProcess
https://github.com/EBalloon/Rw-No-Attach