Hi All - my first post :)
Nextion has just become my most loved LCD screen for my projects.
I cant get enough :) Great Yob done.
But it have for me one flow - that is size.
Why because i would like to be able to make 22- 24" full HD touch.
So perhaps You could produce a board with HDMI and USB input that it could work with Touch monitors like Iiyama,
Best if it would be still a board like You have now in Your LCD, or better a software that could be installed on Raspberry pie zero, or better on Orange pi. It could be still programmed from the same software and use the same uart technology to talk to it.
Greating from Netherland