Questions on Touch Displays for Mega 2560 and Ramps 1.4

Does anyone know if there are more Touch Displays other than the MKS TFT28 & MKS TFT32 that will work with the Ramps 1.4 Shield?

From what I have been able to see is that almost every other Touch Display that supports the Arduino Mega2560 seem to use a separate Shield in order to connect to the Arduino Mega2560. Both the MKS TFT28 & MKS TFT32 seem to use a 8-Pin Parallel Cable that connects to a set of AUX Pins on the Ramps 1.4 Shield.

I am just wondering what all my options are for selecting a Touch Display for my 3D Printer.

One other question I have is if I could use two Arduino's in conjunction so that one can use the ramps 1.4 shield and the other use a Touch Display connected by its LCD Shield?

I have seen that you can connect two Arduino UNO's though the I2C, but am not sure if you can use certain Shields when doing that because of the Pins used. Also I have not found any articles on this being done for Arduino Mega 2560, nor anything like that for a 3D Printer in order to use one for a Display while the other controlled the Printer through the Ramps 1.4 Shield. So I am wondering if this would even be possible.

Any thoughts on these two questions would be appreciated.