First of all, thanks so much for your support and sorry for my delay.
So, I tried create a image with your tool. I enabled the option "KERNEL_CONFIGURE="yes"" on the installation script and during installation I set up "virtualization" option menuconfig. The OS image was generated, however KVM is still not being installed.
Now, I will try compilate just a kernel with your tool in a already running Armbian on my BPI-M2.
If you have some image for BPI-B2 with KVM already running and can make it available I will be very graceful.