Look for linuxflip in an old post of mine Lenovo c13 chromebook Morphius - install via submarine
Follow what Catloaf posted and insert modprobe -r hid_multitouch and modprobe hid_multitouch in the 2 linuxflip scripts, so that switching from tablet mode to laptop mode and viceversa will restart multitouch (on condition the stylus is far from the screen).