Welcome to ARMBIAN 5.27 stable Debian GNU/Linux 9 (stretch) 3.14.29
Linux amlogic 3.14.29 #59 SMP PREEMPT Sun Jun 25 17:07:13 MSK 2017 aarch64
tested the build,
google stackexchange "auto login on xfce in jessie"
and manual start with
systemctl set-default multi-user.target
which turns off hdmi output altogether (would be nice to have the syslog and other errors going via hdmi console as a control monitor for debugging)
using a remote desktop server/client it is possible with your current rom to run kodi on the hd monitor in framebuffer mode and still have a remote desktop client open with a minimalist X on your main machine.
trying out a fast remote desktop app (which pipes the audio unnecessarily too..)
instead of a whole x, i'd prefer a web browser in full screen actually trying out a leaner version just using xvfb
first screen PC, remote desktop client & ssh client
second screen TV / kodi or hdmi control monitor