I have ported the SSD1963 driver to ugfx-arduino. So far it's only targeted at Teensy, but it could probably be made to work with other boards by changing the board file.
I made it work with a Teensy 3.2 with one problem. I can draw using GDISP and the pixels end up in the right position, however, the colors are wrong: apparently only 2 bits of the red and green channels and none of the red channel is used. I did not change the pixel format of the original driver (GDISP_PIXELFORMAT_RGB565). I assume it could have something to do with using 8 vs. 16 data ports, but I'm not sure. I also don