Hi there,
I’ll take a run at it later today, post my results. I have a new project that would need the same as You a custom pcb with an SPI and I2c (touch)
interface only is what I need. RTC would be great but NOT in its present method or tech. 
Seeed should get it back to the lab and release a maker display w/touch only version, that would be GREAT!
HTH
GL 
PJ 
Stay tuned. btw (RUMOR 
) round E-ink display is coming, 