You could try replacing
Code:
OLD_START="/usr/local/Kobo/nickel -qws \&"
NEW_START="LD_PRELOAD=/root/screenInv.so /usr/local/Kobo/nickel -qws \&"
by
Code:
OLD_START="/usr/local/Kobo/nickel -qws -skipFontLoad \&"
NEW_START="LD_PRELOAD=/root/screenInv.so /usr/local/Kobo/nickel -qws -skipFontLoad \&"
in "root/autorun.sh" in KoboRoot.tar of screenInv installer. Do the respective change also in the uninstaller.
I did not try it myself, since I am still on FW 2.4.0.
Those with Glo and Aura can try callingl "/mnt/onboard/.kobo/nightmode.sh\" via the KoboLauncher instead of the KoboTweaks.