Hello,
let me try to answer your questions:
1.) Within the Build Environment for STM32F407 (you can register and download this package) you will find a couple of display drivers - one is using the SSD1963. Although this driver is using the 16bit FSMC parallel interface, maybe this is helpful (e.g. concerning the initialization sequence).
2.) From Embedded Wizard point of view, the guideline is very simple - it is more or less one update function that transfers a rectangular area from the framebuffer to the display. The interesting part is the connection, the prototcol and the initialization sequence of the display controller - and this is defined by the display controller manufacturer.
3.) Yes we have done such display integrations as services. Please contact us directly via contact@embedded-wizard.de for more details.
Best regards,
Manfred