Hi there Richard,
Sounds like you are the person to ask and I know its a number of years on but I am running Mac Mini's (mid 2011) with the Lilliput 9.7inch TFT LCD Monitors and since upgrading to Sierra the touch drivers simply do not work. I have tried every touch driver on the net. Currently installing High Sierra on one of them to test if that mades a difference.
You advise would be much appreciated.
Cheers,
Brian