Newhaven have a 10.1" IPS LCD with 700 cd brightness but you will have to design your own PCB to interface to it and modify u-boot and the kernel.
https://www.newhavendisplay.com/nhd1011 ... -9541.html
It can be done as I just completed a PCB and kernel changes to interface the Nano PC T3 Plus RGB LCD interface to the LVDS interface of the 7" Newhaven display. Plugs directly input the RGB interface on the Nano PC T3 Plus board. I modified u-boot and uImage to support the timing. Display is way better brightness wise that the HD702 I was using. Resolution is lower but still very clear on the 7" size. Sunlight readable is a big boost for this desgin.
The T4's interface is LVDS already so you just need the hardware and software to drive the backlight and a connector for the LCD cable. Not sure where to get the cables for this but they do like like a standard type.